340 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



less promoted ; between the major radii in the wide interspaces tbere are in eacb 

 case a pair of minor radii witiioufc whorls of hairs ; these radii do not appear to 

 cover any shelly ridges or ribs, the surface under them is not, in the specimens 

 examined, perceptibly raised ; the interior is porcellanous white, with a broad, 

 strong muscular impression having a wide anterior hiatus ; when the apex is not 

 central it is more or less anterior to the centre. Diameter of average specimen, 

 5.0 ; height, 2.5 mm. 



U. S. S. "Albatross," station 4656, off Sechura Bay, Peru, in S. Lat. 6° 55' 

 and TV. Lon. 83° 34', in 2222 fathoms, green mud, bottom temperature 35°. 2 F. 

 U. S. N. Mus. 110,570. Seated on cuttle beak, with Cocculiua. 



Another Cephalopod beak bearing similar excavations but no specimens was 

 dredged off Aguja Point, Peru, at station 4654, iu 1036 fathoms, mud, tempera- 

 ture 37°.3 F. 



Cocculinidae. 

 COCClItlNA Ball. 



Cocculma Dall, Proc. U. S. N. Mus., 1881, p. 402 ; Bull. Mu8. Comp. Zool, 1889, 

 18, p. 345 ; type, C. rathbuni Dall, 1881. 



This genus is represented in nearly all parts of the deep sea which have been 

 explored. 



Cocculina agassizii Dall, n. sp. 



Shell small, white, covered with a strong light, olive-colored periostracum, be- 

 neath which it is chalky, ovate-quadrate, high, with the apex about the posterior 

 third, and the anterior longer slope roundly arcuate ; the periostracum is finely, 

 closely, radially threaded, the threads seem to bear very short projecting hairs, 

 but neither the threads nor the hairs appear to correspond to any sculpture of the 

 shell; on drying, the periostracum immediately detached itself from the upper 

 part of tlie shell, showing beneath it only very fine, irregularly concentric lines ; 

 toward the margin it seemed to be more closely attached to the shell and, by its 

 contraction in drying, began at once to split tiie shell, obliging me to return it at 

 once to the liquid from which it had been taken, or it would have gone to pieces 

 entirely; interior of the shell smooth, white, with a broad, short, iiorseshoe shaped 

 muscular impression witli a wide anterior hiatus at about the anterior third of the 

 length ; nucleus small, bulbous, produced, hardly spiral, hut dccurvcd ; the shell 

 enlarges suddenly on entering the ncpionic stage ; animal as usual, with a single 

 posterior cpipodial filament on each side. Alt., 2.0 ; length, 3. 5 ; width, 2.5 mm. 



U. S. S. " Albatross," station 4630, Gulf of Panama, in 556 fathoms, sand, 

 temperature 40°.5 F., on a fragment of wood. U. S. N. Mus. 110,660. 



