666 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Nov. 14, 



colour white : mouth circular, not oblique or sloping : base notched 

 on each side. L. O'l, B. 0"35. 



'Porcupine' Exp. 1870: Atl. St. 16. A single specimen. 



{/ 9. Cadulus gibbus', Jeffreys. (Plate XLIX. fig. 10.) 



Shell barrel-shaped, gibbous in the middle, whence there is an 

 abrupt slope towards each end ; these are equal iu breadth : it is 

 rather solid, glossy, and semitransparent : sculpture none : colour 

 white : mouth obliquely truncated : base slightly notched, but not 

 quite perfect. L. 0"1, B. 0'05. 



' Porcupine ' Exp. 1870, Atl. St. 13 ; a single specimen. 



Distribution. Bay of Biscay (' Travailleur' Exp., 1880); one 

 specimen. 



Allied to C. ovulum of Philippi, but much smaller and not so oval, 

 and the ends are equal in size. The last named species was dredged 

 by Admiral Acton in the Bay of Naples, and by Dr. Fischer in the 

 Bay of Biscay during the 'Travailleur ' Expedition of 1880. 



Class GASTROPODA. 

 Family I. Chitonid^. 



The controversial contributions to the vexed history of this con- 

 fessedly abnormal group in a taxonomical and anatomical point of 

 view seem to be endless. In the ' Proceedings of the Royal Society ' 

 for December 1880 will be found a careful and elaborate paper by 

 Mr. Adam Sedgwick on the kidney of Chiton, showing that Mid- 

 dendorff was right and Schiff and von Iheriug were wrong as to the 

 existence and position of that organ. 



Genus Chiton. 



A. Acanthochites, Leach. 



Girdle covered with spines, and having also tufts of bristles. 



1/ I. Chiton fascicularis, Liime. 



C. fascicularis, L. S. N. p. 1106: B. C. iii. p. 211, pi. v. f. 2 ; 

 V. p. 197, pi. Iv. f. 3. 



' Porcupine ' Exp. 1869 : St. Lough Foyle. 1870 : Atl. Gibraltar 

 B. 



Distribution. Norway to the .^gean and Adriatic (but southern 

 habitats unreliable); Mogador {McAndrew) ; 0-14.5 fms. 



Fossil. Pliocene: Coralline Crag and S. Italy. Post-tertiary : 

 Selsea. 



Perhaps the C. fascicularis of Linne may have been C discrepans. 

 In Philippi's collection at Berlin are specimens of both species named 

 C. fascicularis. If the Linnean name has been misapplied. Pennant's 

 name crinitus ought to be substituted for it. Leach called the 

 present species Acanthochxtes vulgaris. 



Dr. Edward Brandt has examined and compared the nervous 

 system of Chiton fascicularis and Patella vulgata. He considers 



' Gibbous. 



