322 Dr. Gwyn Jeffi-eys on 



Cancellariidae. 



Cancellaria viridula, Fabricius. 

 Tritonium viridulum, Fabr. Fn. Gr. p. 402. 



Body milk-white : head furnished with a long and promi- 

 nent veil : tentacles contractile, thread-shaped, rather long and 

 slender, smooth, with blunt tips, diverging at an angle of 45° : 

 eyes placed on the top of short stalks, at the outer base of the 

 tentacles, with which the eye-stalks are united : foot large, 

 triangular, and long, squarish and double-edged in front, and 

 bluntly pointed behind ; edges uneven : pallial fold (lining 

 the basal groove of the shell) very short and thick. No oper- 

 culum. Active ; crawls out of the water. It emits a greenish 

 liquid on being touched with a camel's-hair brush — a habit 

 that reminds one of Planorbis corneus^ which gives out a 

 purple liquid when irritated. 



Holsteinborg, 30 fms. ; Station 13, 690 fms. (fragment). 

 Spitzbergen, 5-15 fms. (Kroyer, Torell, Eaton). White Sea 

 (Middendorff). Iceland, 80 fms. (Morch). Norway, 20- 

 300 fms. (Sars and others) ! ' Lightning ' Expedition, 500- 

 550 fms. ' Porcupine ' Expedition, 1869, north of the 

 Hebrides, 114-345 fms. : 1870, Channel slope, 305-567 fms. 

 Labrador, 40-50 fms. (Packard). Gulf of St. Lawrence, 30- 

 40 fms. (Whiteaves) ! N.E. coasts of the United States, 

 20-150 fms. Behring Strait ( Wosnessenski) . N. Japan, 

 48 fms. (St. John) ! Fossil : Red and Coralline Crag, and 

 Bridlington ; Christiania (Crosskey and Robertson) !; Labra- 

 dor (Packard). 



I cannot perceive any difference between Cancellaria and 

 MoUer's genus Admete^ except in the former having stronger 

 folds or plaits on the pillar ; these were not noticed by Fabri- 

 cius in his description of the present species. The apex in C. 

 cancellata^ however, is peculiarly sculptured, and somewhat 

 resembles that of Columhella haliceeti. 



Synonyms : Murex costellifer^ J. Sowerby ; Admete crispa, 

 Moller ; Cancellaria hutcinoideSj Couthouy ; C. Couthouyij 

 Jay, Gould. 



Cerithiidae. 



Cerithium jprocerum*^ Jefir. 



Shell pyramidal, solid, opaque, and glossy ; base slightly 

 concave : sculpture^ curved longitudinal ribs, of which there 

 are about 30 on the last and 20 on the next whorl j the three 



* Long. 



