312 PROCEEDINGS OF THE MALACOLOGICAL SOCIETT. 



convex portion showing some indication of cancellation. A feature 

 which seems to have escaped attention is that the last scale of the 

 lowermost transverse rib is formed into an open tube (Fig. II), 

 apparently as a means for conveying water for respiration when the 

 mollusc is closely adhering to corals or other substances. The 

 anterior end of the aperture is narrowed and channelled, and then 

 produced into the open tube above referred to. This also occurs in 

 the variety RohiUardi} 



3. Calliostoma deceptum, n.sp. Pig. V. 



Testa parva, conica, imperforata, rubescenti - albida, seriebus 

 spiralibus granulorum parvorum acutorum (in anfractu penultimo 

 circiter 6) ornata ; spira mediocriter acuta ; anfractus 7 lente 

 accrescentes, primus Isevis, globosus, cseteri in medio subangulati, 

 leviter gradati, supra et infra angulum planiusculi, ultimus basi 

 angulatus, infra seriebus granulorum 7-8 instructus ; apertura 

 irregulariter subquadrata, intus sulcata ; columella incrassata, extus 

 callo prominente marginata. Diam. 7, alt. 9 mm. 



Sab. — Holothuria Bank, 15-34 fathoms, and Baleine Bank, ]S"orth- 

 west Australia (J. J. Walker). 



In the report on the zoological collections of H.M.S. " Alert," p. 72, 

 some young examples of this species were erroneously considered to 

 belong to C. ruhro-punctatum (A. Adams). Full-grown specimens, 

 although showing some similarity to that species, prove that the two 

 forms are distinct. In the present species the series of granules are 

 more numerous, the granules themselves not so acutely conical, and 

 the base more closely granulated. Some examples exhibit scattered 

 pale-brown dots, whilst others are uniformly of a very pale flesh tint. 



4. Terebea Walkeei, n.sp. Fig. I. 



Testa subulata, alba, liris spiralibus granulosis insequalibus, 

 quarum 3-4 cseteris majores, lirisque longitudinalibus gracillimis 

 obliquis cancellata ; anfractus 12, primus magnus, obtusus, Isevis, 

 secundus longitudinaliter fortiter costatus, in medio obtuse angulatus, 

 hand spiraliter lii'atus, cseteri convexiusculi, sutura obliqua sejuncti, 

 ultimus infra medium angulatus, infra concavus, liris 3-4 tenuibus 

 incrementique lineis fortibus granose cancellatus ; apertura irregu- 

 lariter quadrata; canalis anterior obliquus, subrecurvus. Long. 26, 

 diam. 6 mm. 



Sah. — Holothuria Bank, North-west Australia, 10-30 fathoms 

 (J. J. Walker). 



Eeadily distinguishable by the unusual style of sculpture and the 

 character of the apex. Upon the penultimate whorl there are seven 

 spiral granose lirse, four of which are more prominent than the rest. 



1 Leptoconchus RobiUardi, Lieuard : Journ. de Concli., 1870, p. 305 ; 1871, p. 73, 

 pi. i, figs. 6, 6a. 



