60 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Jail. 20, 



2. Cerithiopsis diadema (Watson), Monterosato. (Plate VI. 

 figs. 8, 8 a.) 



C. diadema (Watson), Monterosato in Journ. de Conch. 18/4, 

 p. 273. 



'Porcupine' Exp. 1870: Med. St. 45, Benzert Road, Rasel 

 Anioush, Adventure Bank. 



Distribution. Cap Breton (De Folin), G. Tunis ( ' Shearwater ' 

 Exp.)!, Sicily (Ste/anis and Monterosato) \, Madeira (TVatson)l, 

 Canaries (McAndrew) !, Azores (' Challenger ' Exp.) ! ; 22-500 fms. 



Fossil. Post-tertiary : Messina {Seguenza). 



C.fayalensis, Watson, in Jouru. Linn. Soc. (Zool.) vol. xv. p. 125, 

 1880. I had proposed to name it C.fihula^. 



This pretty little shell, which was partly described by Monterosato, 

 differs from G. tubercularis in being cylindrical, more elongate, 

 narrow, and slender ; its spire is finely tapering ; and some of the 

 longitudinal ribs are set obliquely. Tiie uppermost whorl forms 

 a smooth bulb, and the next two whorls are closely and rather 

 obliquely ribbed lengthwise and crossed by a delicate spiral line 

 near the base of each of those whorls, so as to give the apex an 

 angulated appearance. 



3. Cerithiopsis horrida^ Jeffreys. (Plate YI. figs. 9, 9 «.) 



Shell elongated, thick, opaque, and somewhat glossy : sculpture, 

 numerous and crowded strong tubercles or nodules, which cover the 

 surface and give it a rugged aspect ; there are 4 rows of tubercles 

 on the last whorl, and 3 on each of the upper whorls, except the two 

 uppermost ; the first or topmost is bulbous or globular and smooth, 

 and the second is marked lengthwise with several short curved ribs ; 

 the base is concave and encircled by a slight ridge : colour pale 

 brownish-yellow : spire tapering and turreted ; apex blunt : whorls 

 15-16, rather flattened or compressed; the last equals about one 

 fourth of the shell : suture narrowly channelled and distinct : mouth 

 squarish, truncated at its base : outer lip thickened : inner lip 

 forming a thick fold or deposit on the lower part of the pillar, which 

 is nearly straight : canal very short and triangular, L. 0-35, B. 

 0-075. 



'Porcupine' Exp. 1870 : Med. St. Rasel Amoush. 



Bistribtition. Sicily {Monterosato), Smyrna (McAndrew), Madeiia 

 (JVatson) ; 16-49 fms. 



4. Cerithiopsis barleei, Jf^ifreys. 



C. barleei, B. C. iv. p. 268 ; v. p. 217, pi. Ixxxi. f. 2. 



'Porcupine' Exp. 1869: St. 9. 



Distribution. British and Irish coasts, Arcachon (Lafont) I, Cap 

 Breton (De Folin) !, Naples and Sicily (Tiberi and others) ! ; 

 25-40 fms. 



' Whether it is the species which Mr. Watsou proposed to name diadema may 

 be questionable ; but it quite agrees with the notice of that species given by 



Monterosato. 

 - Eough. 



