POL1 PI. \ri.|-|l<>i:A. 



(1). Species with nuked irirdh- he cull- 7o// ////. 

 (2). Species \vitli scaly irinlle are called 1.,-jiiilnj. < ales 



are small, (!iimm>/>l't.c if they are larger. 



(3). Species with spinnse or hairy girdles arc classed 

 <t. as Ac.anthochites if tufts are present. 



b. as Chceloj>ltur<i if girdle ha- hairs. 



c. as Antnthnjiti'iira if girdle has spines. 



The names Schisochiton, Leptochiton, 0)iithochiton,eic.'.\r( \\-<d in 

 a variety of senses, or with no sense at all ; lut in no case, so far as 

 I can learn, for the groups correctly so termed. Rochebrune's types 

 are in the Paris Museum. 



There are also included herein a few species carefully described 

 by well-known authors, but without reference to the internal char- 

 acters. These are mostly quite recognizable specifically, but they 

 require re-examination to ascertain their generic affinities. 



The species are grouped geographically. 



1. Northern Europe and N. Atlantic species. 



ONITOCIIITON [sic] RHYGOPHILUM Rochebrune. Shell ovate, car- 

 inaied, ochraceous; anterior valve smooth; posterior part of the 

 posterior valve and lateral areas of intermediate valves very minutely 

 granulated ; central areas lacunose at the sides. Marginal ligament 

 somewhat wide, pale rufous. Length 17, breadth 10 mill. (Eochebr. 

 in Bull. Soc. Philom. de Paris, 1883-1884, p. 32). 



Coasts of Norway (Coll. Petit), rare Paris Museum. 



CHITON RARINOTA Jeffreys. Vol. XIV, PI. 4, fig. 86. 



Shell oblong-oval, arched, rather thin and glossy : plates broader 

 in the middle than at the sides; lateral areas indistinct. Sculpture 

 consisting of white tubercles, which are few in number and irre- 

 gularly scattered; these are round in the middle of the shell, but 

 become more raised and oval at the sides; under a microscope can 

 be detected numerous and close-set lines or stria*, which are arranged 

 lengthwise; colour whitish; beaks none, except on the tail-plate, 

 where they are nearly circular: inside glossy. (Jeffr.) 



Length 24, breadth 1} mill. 



North Atlantic. 



C. rarinota JEFFR., MolL of Lightning' and ' Porcupine ' Expe- 

 ditions, in P. Z. S. 1882, p. 668, t. 50, f. 1. 



