\ LHTHOCHTTE8-CR1 i'i<>< < >\< B 



(>i nlmrt AnV/rx, sihi:itcl ni-:ir tin- -utiire- upon the sides of 

 tin- valves and I'.inr arounl the li-:nl valve. 

 Lengtb :\-\. breadth 11 mill. -dried speeimen.) 

 Length 38, breadth 2<> mill. . o. <v - 



Dunedin to Auckland, New Zealand. 



Chitim porosus Un:un\\ , Klements of Conchology, p. 189, t. 28, 

 f. 1 (1815). Cryptoconchus porosus H. & A. AD., Gen. Rec. Moll. 

 iii, t. 55, f. 4. CHENU, Manuel, i, f. 2884. HUTTON, Man. N. /. 

 Moll., p. 118 (1880). Chiton monticularis QUOY &GAI.MAI:I>, \'oy. 

 de 1'AstroL, p. 406, t. 73, f. 30-35, (1834). Sown., Concii. 

 Illustr., f. 129. REEVE, Conch. Icon., t. 10, f. 57. Chiton lcn<-h'> 

 ;, Diet. Sc. Nat. xxxvi, p. 554 (1825). ? Cryptop lax 

 l.i-AiNv., /. c., vol. xii, p. 124 (1818). ? GryptocoHcbw 

 steivartianus ROCHEBR., Bull. Soc. Philomath. Paris, 1881-1882, 

 ]. 194. 



The girdle varies from bright orange to light brown in the living 

 animal (figs. 57, 58). The gills are posterior. 



A. FLORIDANUS Ball. PI. 3, figs. 63, 64. 



Elongated and narrow ; black, purple-black or light brown, with 

 a linear white space along the summit of each valve. 



Valves entirely covered except a round dot at the apex of the Jirt, 

 aiitl a narrow band along the ridge of the other seven, the band slightly 

 diluted at the apex of each valve. These exposed portions are whit- 

 ish or purplish, smooth or showing faint transverse growth stria?. 

 The posterior edges of each valve, seen through the dried skin, are 

 produced backward in wide but not deep rounded lobes on each side 

 of the apex. Posterior valve with subcentral mucro. 



The disconnected valves are white or pink and purple ; the inter- 

 mediate valves being rectangular in general shape, with a sinus 

 before and behind, the posterior sutural lobes rather narrower than 

 the anterior ; and there is one slit on each side. The posterior valve 

 has a gentle wide upward wave posteriorly, with a single Mopaloid 

 slit on each side, and several (4) unequal slits between them. Ante- 

 rior valve having 5 slits. 



Girdle rather wide, leathery, naked; when fresh having the color 

 and "texture of a moist prune"; bearing at each suture a minute 

 bristlo-pore, and four such pores around the head valve : each pi.iv 

 l>earin;j; some short bristles, scarcely projecting above the sari 

 pores and bristles always inconspicuous, frequently invisible 

 (aborted?). 



