348 BULLETIN OF THE 



tentacles are longer, and the foot proportionally shorter, than in C. Rathhuni; 

 the mantle margin more puckered (l>y the effect of the alcohol?); the margin- 

 ation of the muzzle is interrupted in front by the papillose oral area, which in 

 this species distinctly forms the end of the muzzle, the effect of which is to 

 modify the marginated part into two lappets, one on each side, extending from 

 the end of the muzzle to the anterior edge of the foot. In the dentition the 

 bands of uncini are proportionally longer and wider, and the rhachidian tooth 

 is smaller than in the preceding species. 



This species was found by the U. S. Fish Commission, in 1880-81, at Sta- 

 tions 871, 894, 9i7, and 997, in 100-365 fms., muddy and sandy bottom, tem- 

 perature at the bottom ranging from 40°.0 to 52°.0 F. It was obtained by the 

 party on the Blake at Station 288, in 399 fms., hard bottom, off Barbados; 

 Station 195, in 502^ fms., sand and ooze, off Martinique; at Station 161, in 

 583 fms., lava sand, off Guadelupe, bottom temperature 41°; and at Station 

 230 in 464 fms., off St. Vincent, bottom temperature 41°.5 F. 



Section COCCOPYGIA Dall. 

 Foot without epipodial filaments. 



Cocculina spinigera Jeffrets. 



Plate XXXI. Figs. 7, 8, 9. 



Cocculina spinigera Jeffreys, Triton Moll, P. Z. S. 1883, p. 393, pi. xliv. figs. 1, 1 a-C. 

 Verrill, Trans. Conn. Acad., VI. pp. 203, 271, 1884. 



Habitat. U. S. Fish Commission Stations 997 and 2115, in 335 to 843 fms., 

 living in the tunnels of Teredo-bored wood, associated with C. leptalea Verrill. 



This species, obtained by Dr. Jeffreys in the Porcupine and Triton dredg- 

 ings in the North Atlantic, is much smaller than either of the two preceding, 

 or the specimens I have seen may not be fully grown, averaging only 1.5 to 

 2.0 mm. in length. It has the form of C Beanii, so far as the shell is con- 

 cerned, with the sculpture of the most strongly sculptured specimens of that 

 species, which, as above mentioned, sometimes have minute spinose projections 

 at the intersections of the radiating and the concentric ridges. , The nucleus, 

 however, in the specimens of G. spinigera examined, was constantly present, 

 symmetrical and subspiral. Seven specimens were kindly sent me by Dr. 

 Jeffreys for examination, with the soft parts, comprising four males and three 

 females. The soft parts of the females agreed in all particuLars with those of 

 C. Rathhuni except that the pair of epipodial posterior papilla) was wanting, as 

 also in the males; the tentacles seemed to be somewhat stouter and shorter; 

 the gill was very short and triangular, in its usual position, and the anal 

 papilla was prolonged into a kind of free tube, one half longer than the gill 

 itself. 



The dentition resembles that of C. Rathhuni in all essential particulars, ex- 



