MOLLUSCA or THE ' CHALLENGER ' EXPEDITION. 609 



spiralled between the ribs, and having a very small, conical, blnut 

 embryonic apex, consisting of from 4 to 5 whorls. 



4. SCALARIA EUNICULATA, n. sp. 



St. 122. Sept. 10, 1873. Lat. 9° 5' S., long. 34° 50' W. Off 

 Pernambuco. 350 fms. Mud. 



Shell. — Small, rather stumpy, with strongish pinched-outribs, 

 and compact crimped spirals ; the base is broad, flat, and en- 

 circled with, a strong spiral thread. Sculpture. Longitudinals — 

 on the last whorl there are about 10, on the earlier whorls rather 

 more, strongish ribs, which have broad bases and narrow crests ; 

 they run very straight down the spire, but have each a minute 

 twist to the right at the top, and almost inappreciably to the left 

 at the bottom of the whorls ; they do not extend to the base. 

 Spirals — the whole surface is covered with small, flattened, close- 

 set threads, only sej)arated by extremely minute scratches ; these 

 threads are finely crimped, which gives them the rope-like ap- 

 pearance under the microscope from which the name of the 

 species is derived. Colour darkish. Spire high, conical, with a 

 broadish base. Apex broken. Whorls — 8 to 9 remain ; they are 

 regularly convex ; the last is broadish, short, with a broad square 

 flat base defined by a strongish thread round the outside. Suture 

 narrow, impressed, rather oblique. Mouth perfectly round. 

 Outer lip prominent beyond the last rib, rounded, blunt. Inner 

 lip \erj short on the body, which it crosses with a small shelf, 

 of which there are traces all round the mouth within the outer 

 edge. H. 0-23. B. O'OSS. Penultimate whorl, height 0-037. 

 Mouth, height 0-04, breadth 0-04. 



I have a Scalaria of my own dredging at Madeira which ex- 

 tremely resembles this species, but is distinct. It is narrower, 

 the crimping of the spirals is finer, the longitudinal ribs extend 

 to the base, which is rounded and has the basal thread much 

 more within the contraction of the basal rounding than is the 

 case here. 



Crossea, a. Ad. 



CrOSSEA STRIATA, n. Sp. 



St. 187. Sept. 9, 1874. Lat. 10° 36' S., long. 141° 55' E. 

 l«[ear Cape York, N. Australia. 6 fms. Coral-sand. 



Shell. — Very small, white, turbinate, spirally striated, with a sub- 

 ecalar spire, a minute rounded apex, tumid last whorl, and a small 

 strongly bordered umbilicus. Sculpture. Longitudinals — there 



lustn". jotjrk. — zoology, yol. xvi. 45 



