346 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



body whorl ; throat, pillar, aud body smooth without liratiou. Type, P. rubida 

 Dall. 



Clanculus (Panocochlea) rubidus Dall, n. sp. 



Plate 8, figures 3, 4. 



The two specimens described below are believed to be young and adult of the 

 same species, tliough in one case the color of the external shell is rose-pink aud in 

 the other brick-red or dull vermilion. Unfortunately the condition of the frag- 

 mentary adult is so extremely fragile, owing to decay, that it could not be en- 

 trusted to an artist for illustration, and the characters of the aperture in the adult 

 are not shown in the figures of the young. Neither specimen contaiued the oper- 

 culum or soft parts, but there is little doubt that the two specimens are conspe- 

 cific. The shell appears to occupy in the system a place half-way between the 

 Oriental Clanculus aud the South American Mouodouta, but rather nearer to the 

 former. 



Young shell small, pearly, with an opaque outer coat, and about four and a 

 half whorls; above rose-pink, whitish at the apex, base cream-colored; form 

 depressed turbinate ; nucleus smooth, very minute, globular, followed by one aud 

 a half similar turns ; tlie succeeding whorl rounded, gradually becoming flattish 

 above, with a single, small, simple peripheral keel, the sculpture then gradually 

 taking on the adult characters and the pinkish color ; suture narrow, applied raid- 

 way between the peripheral and next posterior keel, deeply channelled, with its 

 anterior margin beaded; spiral sculpture on the last whorl of four, prominent, 

 more or less distinctly beaded keels, one close to the beaded sutural margin, 

 the next separated by a much wider space, the next two nearer, equidistant, the 

 first peripheral, and the second at the margin of the evenly rounded base ; tlie 

 keels are more or less articulated by crimson dots ; the whole surface is also finely 

 spirally striated ; axial sculpture only of incremental lines somewhat intensified 

 at intervals ; aperture rounded, very oblique, outer lip thin, sharp, a little crenu- 

 lated by the keels ; body with a wash of callus ; pillar arcuate, short, very thick, 

 with a prominent basal tooth, the axis imperforate. Height of shell, 4 ; of aper- 

 ture, 2.5 ; max. diam. 6 mm. 



U. S. S. " Albatross," station 3355, Gulf of Panama, in 1S2 fathoms, mud, 

 bottom temperature 54°. 1 F. U. S. N. Mus. 122,953. 



Adult fragment. Sjjccimen broken, but showing the characters sufficiently for 

 description ; general form depressed-turbinate, with four aud a lialf whorls ; color 

 brick-red, paler on the prominences ; suture closely appresscd to a periplieral 

 keel, whicli on the spire is smooth, on the last whorl undulate ; the sutural mar- 

 gin of the last whorl is marked by a very strong, low, coar.stly beaded spiral rib, 

 in front of which the whorl is very flatly arched to the jxriijlicry ; on this surface 

 arc six or seven rather strong beaded tlircads similar to that forming the periphery, 

 their intervals appear irregular and contain many extremely fine, obscure, spiral 

 threads; base forming an imperforate flattened dome, with one spiral tlircad ucar 



