170 appendix-patellid.t:. 



gin eutire, length 7-4, breadth 5"7, alt. o lines, {Mice, in Moll. Nov. 

 HoU. Spec. p. 34.) 



Western Australia. 



This is not P. insignis Dkr., a synonym of P. testudinaria. 



It is probably the same as Acmcea cruciata Linn. 



AcM.EA ARANEOSA Gould. PI. 73, figs. 90, 91, 92. 



Shell small, thin, rounded, slightly elevated, smooth, and without 

 ribs or sculpture ; apex nearly central, obtuse. Color pale yellow- 

 ish-green, reticulated with very fine rusty-brown lines, branching off 

 like rootlets towards the margin. The interior is whitish, with a 

 rusty ring just within the muscular impression ; the edge is sharp 

 and simple, and has a well-defined lirabus, so thin as distinctly to 

 repeat the external linear markings. 



Length five-eighths of an inch ; breadth half an inch'; height 

 one-fourth of an inch. (Gld.) 



A pretty little shell, most probably a Lotti, resembling some of 

 the species figured by Quoy, especially his orbicularis. Indeed it is 

 so like the reticulated variety figured in Quoy's pi. 71, fig. 33, that 

 the examination of a more extensive series might show them to be 

 identical. (Gld.) 



Sooloo Sea. 



Patella {Lottiaf) araneosa Gld., Proc. Bost. Soc. N. H. ii, p. 

 152 (1846) ; U. S. Exped. p. 347, figs. 450. 



Patella Barbara Linne. (Page 96.) 



No locality is given in the text for this species. I am informed 

 by Mr. Geo. W. Taylor that it is abundant at the Cape of Good 

 Hope. 



Helcioniscus reynaudi Desh. (Page 130). By a typographical 

 error this name is spelled incorrectly in the text. 



Family PATELLIDiE. 



Dr. Thiele, in his continuation of Troschel's Das Gebiss der 

 Schnecken (received at Philadelphia since the publication of part 50 of 

 the Manual, in which my own classification of Patellidce was out- 

 lined), divides the family according to the characters of the radula 

 into groups as seen below^ The great merit of Dr. Thiele's work 

 consists in his demonstration of the existence of a rhachidian tooth 



