POLYCHAETOUS ANNEUDS 



35 



as given by Chamberlin (1919, p. 130) the presence or 

 absence of a terminal cirriform appendage on the end of 

 the parapodium is taken as an important diagnostic 

 character. In the Carnegie material it was not easy to 

 determine in all cases whether this cirrus (or these cir- 

 ri, for in some genera there are two) is present and 

 some errors in identification may have arisen. The 

 author has separated Corynocephalus from Rhynchoner- 

 ella mainly on the character of the setae, the head being 

 often too distorted for any accurate description. Cory- 

 nocephalus has a large percentage of spikes in the ante- 

 rior parapodia, whereas Rhynchonerella has very few. 

 Corynocephalus has only simple setae, whereas Rhyn- 

 chonerella has compound. In these latter the terminal 

 joint is very small and in slender setae it often looks as 

 if it were merely a bent terminal part. 



Genus ALCIOPA Audouin et Milne-Edwards 



Alciopa distorta n. sp. 

 (Plate I, figures 16, 17; plate H, figure 18) 



The body is 38 mm long and 3 mm wide at the wid- 

 est part, tapering from there to a width of less than 1 

 mm at the anterior end and to a much less width at the 

 pygidium. The anterior body region as far back as the 

 fifth somite is rather rigid, apparently owing to the 

 heavy pharynx, but behind this point it is much distended 

 and thin walled. Although the body wall is translucent, 

 no internal organs can be seen through it, and its whole 

 appearance is that of an empty shell. 



The eyes are large and their lenses are directed 

 downward. Between them on the dorsal surface is a 

 wide and rather deep depression in which lies the short 

 stumpy median tentacle, attached at about the level of 

 the mid-diameter of the eyes. The anterior prostomial 

 margin is rounded but has a median notch. In front of 

 this lie the frontal tentacles, which are ovate in outline 

 and larger than the median. The base of the first ten- 

 tacular cirrus forms a sort of cup which partly encloses 

 the eye, its terminal part extending to the outer eye 

 margin (pi. I, fig. 16). The second somite has on either 

 side a pair of very small cirri, which, owing to distor- 

 tion of the specimen, show only on one side in the figure. 

 The third somite has a large, ovoid ventral cirrus and a 

 more slender dorsal one; the fourth has cirri similar to 

 these but much heavier; on the fifth the ventral cirrus is 

 small and the dorsal one very large; the sixth has more 

 of the form of those in succeeding somites and is the 

 first one which has setae. Beginning with the seventh, 

 each somite has a very prominent dark-brown pigment 

 spot on the dorsal surface near the parapodial base. 



As noted above, the pharynx, when retracted, gives 

 the anterior region of the body a rigid appearance and it 

 is wider here than elsewhere. The appearance of the 

 protruded pharynx is shown in plate I, figure 17. Its 

 margin is recurved, which may possibly indicate mere- 

 ly an incomplete protrusion and the lateral lobes are 

 short and conical. The parapodia (pi. 11, fig. 18) are 

 relatively small, their vertical diameters being much 

 less than that of the body, and the cirri are also small. 

 The dorsal cirrus is attached to the parapodial margin 

 for its entire length but the ventral one is free except 

 for its point of attachment. 



The type is no. 20084 in the United States National 



Museum and was collected at station 137 in 50 m. 

 Others were collected between stations 1 and 2 in 100 m 

 and at station 84 in 50 m. See map 2 (p. 57). 



Genus TOREA Quatrefages 

 Torea pelagica Chamberlin 



Torea pelaglca Chamberlin, 1919, pp. 131-133, pi. 24, 



figs. 4-9. 



Collected in 50 m at station 88 and in 100 m at sta- 

 tion 102. See map 2 (p. 57). 



Torea fasciata n. sp. 

 (Plate II, figures 19, 20) 



A slender species marked by prominent dark-brown 

 bands throughout the entire body length, the ground col- 

 or of the body being light yellowish-brown. The bands 

 vary in size, sometimes involving only one somite and 

 in other cases covering as many as three. They may be 

 separated by as few as three or as many as eight so- 

 mites, and they generally extend entirely around the 

 body. The dark-brown segmental glands found in many 

 genera of this family did not appear in either of the two 

 specimens at the author's disposal. 



Neither of the two individuals is entire and both are 

 badly macerated about the anterior body region. The 

 type retains 110 of the anterior somites and is 42 mm 

 long. The width at the eyes is 2 mm, which is nearly 

 twice that of the first somites. In the type there is a 

 gradual narrowing of the body to the region of the tenth 

 somite and behind this an increase to the fifteenth, 

 where it is about 1.5 mm wide. This width is retained 

 to the end of the fragment. 



Because of imperfect preservation, a complete de- 

 scription of the prostomial appendages and first pairs of 

 parapodia is impossible. On the dorsal surface no ten- 

 tacle is visible. Ventrally (pi. II, fig. 19), one anterior 

 tentacle remains. The eyes are very large, are nearly 

 in contact on the ventral surface, and their lenses point 

 ventrolaterally. There are three pairs of tentacular 

 cirri, those of the first somite are the largest and ex- 

 tend to the outer border of the eye. The second pair is 

 smaller and about equal in size to the third. In the 

 specimen figured the first was broken on the right side 

 (left in figure), and the ventral one of the second pair on 

 the left was also injured. The first three parapodia are 

 very short and have no setae; the fourth is longer and 

 has a single seta; the fifth is still longer and has more 

 setae. Throughout the greater part of the body the para- 

 podia are longer than the body diameter. Each has a 

 setal part which is conical in outline and carries a sin- 

 gle large acicula (pi. II, fig. 20) and a tuft of very slen- 

 der, long, compound setae. The dorsal and ventral cir- 

 ri are flattened, the former a trifle more separated 

 from the setal part than is the latter but both are small 

 in comparison with the setal lobe. Setae are very slen- 

 der and long, and only in a few cases were the terminal 

 joints retained. This joint is small as compared with 

 the basal one. 



The type is no. 20085 in the United States National 

 Museum and was collected in 50 m at station 133. Others 

 were collected at stations 79 and 132 in 50 m and at sta- 

 tion 23 in 100 m. See map 2 (p. 57). 



