32 



BIOLOGICAL RESULTS OF LAST CRUISE OF CARNEGIE 



transparent, much wrinkled bit of tissue attached to the 

 head is the first elytron, none of these are present. The 

 anterior eyes are somewhat larger than the posterior 

 and placed farther apart. All eyes are brown in color. 



A parapodium from the middle of the body (pi. I, fig. 

 2) is long and slender and has two nearly equal lobes at 

 the apex, the setae protruding to the surface from be- 

 tween the lobes. There is one very stout acicula which 

 does not quite reach the surface. The dorsal cirrus is 

 long, extending beyond the apex of the parapodium. The 

 ventral one is much smaller. Just ventral to the dorsal 

 cirrophore is a very small lobe representing the noto- 

 podium, which contains one small acicula but no setae. 

 The notopodial setae are of two kinds. Those of the dor- 

 sal part of the tuft are long, slender, and numerous in 

 the bundle; the ventrally placed ones are much heavier 

 and less numerous. The latter have straight shafts 

 which expand near the ends and then narrow abruptly 

 (pi. I, fig. 3). There is a heavy terminal and a smaller 

 subterminal tooth. On one side, near the expanded part, 

 is a row of very small teeth. 



One specimen has a protruded pharynx which carries 

 nine marginal lobes on each of the dorsal and ventral 

 lips, and paired teeth on the ventral lip. 



The type is no. 20078 in the United States National 

 Museum, and was collected in 50 m at station 41. Others 

 were taken in 50 m at station 39 and in 100 m at station 

 94. See map 1 (p. 56). 



FAMILY PHYLLODOCIDAE 



Genus HALIPLANELLA Reibisch 



Reibisch states that the chief difference between Hal - 

 iplanella and Haliplanes (1895, pp. 24-25), is that in the 

 latter there are four tentacles, whereas in the former 

 there are two, and thinks that because the second pair 

 is sometimes pressed against the lower surface of the 

 prostomium and hence not easily seen, there may have 

 been confusion of these genera in the literature. In the 

 specimens in the Carnegie collection there certainly are 

 no second tentacles and the author has assigned them to 

 Haliplanella. This has one pair of tentacles and no eyes 

 on the prostomium. On the first somite are dorsal and 

 ventral cirri and a tuft of stout, simple setae. The sec- 

 ond somite carries on either side a single long tentacu- 

 lar cirrus. 



Haliplanella pacifica n. sp. 



(Plate I, figures 4-6) 



The type is 1.4 mm long and 1.1 mm wide, with a 

 prostomial width of 0.4 mm. The general form of the 

 prostomium is that of a rounded sugar loaf divided into 

 anterior and posterior parts by lateral indentations on 

 the sides just anterior to the point of insertion of the 

 tentacles (pi. I, fig. 4). The anterior of these divisions 

 is nearly twice as wide as long, and its anterior margin 

 shows a faint division into three lobes. The tentacles are 

 longer than the width of the anterior part of the prosto- 

 mium and are attached on its ventral surface. Near this 

 point of attachment the prostomium abruptly widens. The 

 first somite is short with slender dorsal and ventral cir- 

 ri, the latter reaching to the fourth somite. The second 

 is nearly twice as long as the first and carries very long 

 dorsal cirri. The ventral cirri of this somite consist of 



a short conical style carried on a relatively prominent 

 cirrophore. In the type the following twelve somites 

 have heavy dorsal cirri bluntly rounded at the ends but 

 the last four pairs of these are not quite as heavy as 

 the others. The ventral cirri of these somites are sim- 

 ilar in outline to the dorsal but very much smaller. On 

 either side of the anal somite is a bluntly rounded lobe. 



The setae of the first somite make up a small bun- 

 dle of only four or five. Some of these taper smoothly 

 to an acutely curved point, others have a constriction 

 near the end which is more noticeable in some than in 

 others (pi. I, fig. 5). In all later somites the setae are 

 compound and built on the plan of the one shown in 

 plate I, figure 6. The basal joint is long and slightly 

 curved, expands a little at the end and on one side of 

 this expansion carries a small spine. There are two 

 terminal joints, one rather short and stout inserted 

 next to the spine, and the other much longer and more 

 slender. In somites 2, 3, and 4 these setae are few in 

 number and are all rather stout though one is heavier 

 than the others. Beginning with somite 5 the setal ar- 

 rangement is such that there is a tuft of long slender 

 compound setae having the structure described, and 

 one of the same structure but much heavier. This in- 

 crease in the size of the large setae is more noticeable 

 in posterior somites. The setal lobe of the parapodium 

 is sharp-pointed and shorter than either dorsal or ven- 

 tral cirri. A single acicula comes to the surface at its 

 apex. 



The type is no. 20079 in the United States National 

 Museum and was collected in 100 m at station 23. Others 

 were taken in 50 m at stations 24, 46, and 99. See map 

 1 (p. 56). 



Genus LOPADORHYNCHUS Grube 

 Lopadorhynchus varius n. sp. 



(Plate I, figures 7-10) 



The type is 3 mm long and 1 ram wide, counting the 

 parapodial length. The prostomium (pi. I, fig. 7) is 

 bluntly rounded along its anterior margin, which is con- 

 tinued laterally into the dorsal tentacles. The ventral 

 tentacles are attached ventrally to, and are much small- 

 er than the dorsal. There are no eyes. Two pairs of 

 large tentacular cirri are attached to the proper somites, 

 and are long enough to extend beyond the first parapodi- 

 um. The author was unable to find any trace of ventral 

 cirri corresponding to these. There is a rounded lobe 

 looking like a cirrophore which may represent these 

 cirri, but no trace of styles. 



There are sixteen parapodia, of which the first two 

 are shorter and stouter than the succeeding ones and 

 protrude nearly at right angles from the body; later 

 ones become more and more folded against the sides of 

 the body. The first two parapodia carry the heavy hooks, 

 sharp-pointed setae, whose curved shafts occupy a con- 

 siderable part of the parapodium and whose apices ex- 

 tend beyond its margin (pi. I, fig. 8). In the specimen 

 figured there were six of these. There is a short, ovate 

 dorsal cirrus. Later parapodia are similar to these in 

 general outlines but are more slender. The outer pos- 

 terior surface is flattened, and forms a broad, slightly 

 curved plate from which arises a tuft of twenty-five to 

 thirty natatory setae. In some of the more anterior 

 parapodia there are a few simple setae but they do not 

 appear in posterior ones. In general these resemble 



