94 POLYPLACOPHORA. 



Although this is a very small species, and might be regarded as 

 the young of some other species, I must observe that I have carefully 

 compared both specimens with the young of all other European 

 species of Chiton known to me, and some specimens of which last 

 mentioned species are much smaller than those which I have now 

 described. The peculiar character of having so very few and 

 scattered tubercles is not presented by any other of those species. 

 The girdle is membranous and thin. (Jeffr.) 



CHITON SCABRIDUS Jeffreys. 



Shell oval-oblong, somewhat depressed, of a dull hue, plates 

 narrow; all except the ternimal ones are nearly equal in width; 

 the lateral compartments in each valve are indistinct and not raised 

 above the middle portion. Sculpture consisting of minute tubercles 

 arranged in several longitudinal rows, which are distinctly defined 

 in the middle, and radiate or diverge to the margin on the lateral 

 and terminal spaces. There is no central ridge, color yellowish- 

 brown; beaks inconspicuous, except on the tail plate. Insfiie 

 glossy, furnished toward each side of all the plates except the head 

 plate with obtusely triangular leaves which serve to interconnect 

 the plates, Margin slightly and irregularly notched. Length '2125, 

 breadth '125 inch. (Jeffr.) 



Goodrwgton, Torbay ; Jersey; England. 



Jeffreys, in Ann. Mag. N. H. (5), vi, 1880, p. 33. 



This may be a Hauleya, as Jeffreys compares it H. hanleyi and 

 mendicarius. 



2. Mediterranean and West African species. 



CHITON PHASEOLINUS Monte rosato. Shell narrow, the valves 

 obtuse, not carinated ; lateral areas and end valves not striated, but 

 concentrically rugose; median areas longitudinally 2-3 striate. 

 Girdle subimbricated with most minute scales. 



Length 15, width 7*5 mill. 



Naples (A. Costa) ; Palermo (Monts.) 



Chiton rubicundus var. phaseolinus MONTS., Nuova Rivista della 

 Conch. Medit, p. 21, 1875. Chiton phaseolinus Monts., CARUS, 

 Prodr. Faun. Medit. ii, pt. 1, p. 179. 



Known to me only by the above description. 



