34 



BIOLOGICAL RESULTS OF LAST CRUISE OF CARNEGIE 



cial resemblance to an eye. On either side somites 1 

 and 2 carry a single tentacular cirrus. These are much 

 larger than the corresponding cirri in P. macixlatus (see 

 below) andthe second is much larger than the first, being 

 fully as long, though not so thick, as the parapodium of 

 the fifth somite. They are located much nearer the ven- 

 tral body surface than are the first. Setae appear in the 

 second somite but not in the first. The parapodia of so- 

 mites 3 and 4 consist each of a dorsal and a ventral 

 rounded lobe which are scarcely longer than thick, the 

 dorsal one being located a little posterior to the ventral. 

 A tuft of long slender setae lies in the setal part. The 

 parapodium of somite 5 has a dorsal lobe which is shaped 

 like that of somite 4 but is larger, whereas the ventral 

 cirrus in form is much like that shown in plate I, figure 

 12 of P. maculatus. The dorsal cirrus is heavier and 

 more bluntly rounded than in P. maculatus. Later para- 

 podia differ from this mainly in the greater size and 

 larger number of setae which spread out fan wise. The 

 setae are slender and compound, essentially similar to 

 those of P. maculatus (pi. I, fig. 13). 



The type is no. 20081 in the United States National 

 Museum and was collected at station 5 in 50 m. Others 

 were taken at stations 3 and 57 in 50 m, at station 59 in 

 100 m, and at the surface at stations 60, 61, 72, 73, and 

 97. See map 2 (p. 57). 



Phalacrophorus maculatus n. sp. 



(Plate 1, figures 11-13) 



The type specimen has about thirty somites, the pre- 

 cise number being in doubt because of the crowded con- 

 dition of the extreme posterior end. The length is 3.5 

 mm. The prostomium (pi. I, fig. 11) is rounded on its 

 anterior margin, its width being a trifle more than its 

 length. In common with the somites immediately follow- 

 ing, it has numerous small pigment spots on the dorsal 

 surface and a row of larger spots along the anterior 

 margin. There are two eyes set well toward the margin. 

 Somites 1 and 2 have each a pair of tentacular cirri that 

 are considerably larger on 2. A few slender compound 

 setae arise near the base of the second tentacular cir- 

 rus, but none are on the first. Somites 3 and 4 carry 

 setae tufts which arise practically from the somite sur- 

 face, the parapodial elevation being very small. There 

 is a short ventral cirrus. Beginning with somite 5 the 

 parapodia become prominent and later ones increase in 

 size toward the middle of the body. The parapodia are 

 all thick in proportion to their length, and there is little 

 decrease in size posteriorly. The chief difference be- 

 tween the two regions is that whereas anterior parapo- 

 dia project at right angles to the surface, posterior ones 

 are pressed against it. The setal lobes are conical in 

 outline (pi. I, fig. 12) and carry a slender, colorless, 

 sharp acicula which protrudes from the apex. The dor- 

 sal cirrus is rounded and much shorter than the setal 

 part. 



The setae are all very long, slender, and compound 

 (pi. I, fig. 13). 



Dorsally the body carries many small dark brown 

 pigment spots which, except for the anterior somites, 

 have a tendency to lie along the margins, and on the 

 parapodial surface leave the median region clear. Ven- 

 trally these are more uniformly distributed and in addi- 

 tion there are larger brown spots lying one at the base 

 of each parapodium. In some the parapodial region is 



very dark-colored, whereas the remainder of the body 

 is much lighter. 



The type is no. 20082 in the United States National 

 Museum and was taken on the surface at station 39. 

 Others were collected as indicated below. 



♦This sample was taken at 10m. (See map 2, p. 57). 



Phalacrophorus attenuatus n. sp. 

 (Plate I, figure 14) 



This species is represented in the collection by a 

 number of specimens, none of which is entire or well 

 preserved. The largest piece is 15 mm long and con- 

 tains forty somites. The greatest width is about 0.25 

 mm. The prostomium (pi. I, fig. 14) is rounded on its 

 anterior margin much as is P. maculatus; there are two 

 brown eyes and brown spots along the anterior margin. 

 The tentacular cirri on somites 1 and 2 resemble those 

 of P. maculatus, the second one being the larger. There 

 is a setal lobe on the second somite. The third, fourth, 

 and fifth parapodia are about equal in length to the setal 

 part of the second. On the sixth there is the beginning 

 of a dorsal cirrus, and behind this there is an increase 

 in parapodial size so that by the fifteenth they are about 

 equal in length to the body diameter. The setae are sim- 

 ilar to those of P. maculatus. A pair of heavy jaws is 

 visible through the body wall (pi. I, fig. 14). 



The type is no. 20083 in the United States National 

 Museum and was collected in 50 m at station 100. 

 Others were taken on the surface at stations 76 and 112 

 in 50 m, and at station 75 in 100 m. See map 2 (p. 57). 



A fragment of Phalacrophorus of indeterminable 

 species was collected at stations 95 and 96. 



FAMILY ALCIOPIDAE 



Members of this family are very abundant in the 

 collections but, unfortunately, very few specimens are 

 entire so that identification has necessarily depended 

 largely on the character of the anterior ends. In the key 



