3. Systematik. I. Prosobranchia. B. Scutibranchia. c. Cyclobranchia. 83 



Pallochiton Dall = Hemphillia Carp, nee Binney. Nuttallina: zona lanuginosa ; 

 laminae centralis unifissatae. - - T. : P. lanuginosus Carp., von Unter- Calif or nien. 



Sclerochiton Carp. Lorica Acantliopleurae , zona Enoplochitoni siniilis ; laminae 

 obtusae, pectinatae; sinus undatus. levis. 



Francisia Carp., subg. - - Acanthopleura, valvis partim immersis, planatis ; laminis 

 centralibus pleurofissatis ; sinu lobato. Type: Ch. spinosus Brug. 



Dinoplax Carp. Lorica solidissima alata; mucro baud elevatus submedianus ; 

 laminae valvae separatae , acutae , leves ; valvae posteriores autice tendentes ; 

 sinus minimus; zona coriacea, fasciculatim spinulosa. - - Type: Ch. gigas Chemn. 



Middendorfia Carp. = Dawsonia Carp. olim. Lorica et zona extus ut in Acantho- 

 pleura; laminae acutae, extus rugosae , suffultae; sinus planatus baud laminatus. 

 - Type : Ch. Polii Pbil. 



Beanella Dall = Beania Carp, nee Johnst. Lorica et zona inter Acantbopleuram 

 et Isclinocbitonem intermedia; mucro submedianus ; laminae acutae, baud suffultae : 

 zona squamis subspinosis stiiatis vix imbricata. - - Type : Ch. pseudonssoi. Carp, 

 von Malta. 



Arthuria Carp. Lorica tennis; valvae undatae ; mucro posticus , productus : 

 laminae acutae , leves ; valvulae posticae antice projectae , sinus planatus , lami- 

 natus, levis; zona coriacea, levis seu lanugata. - Type: A. filosa Carp. 



Guildingia Carp., subg. - - Placiphora, valvis partim immersis; zona postice emar- 

 ginata. - - Type: G. obtecta Carp., von Neu-Seeland. 



Macandrellus Carp. subg. Acanthochiton , valvis partim tectis ; mucrone ischnoi- 

 deo ; lamina postica rugosim lobata ; areis lateralibus depressis. - Type : M. 

 p lumens Carp. 



Stectoplax Carp., subg. - - Acanthochiton, valvis per duas trientes immersis. - - Type : 

 S. porrecta Carp., Japan. 



Choneplax Carp. Animal repens satis elougatum ; valvae expositae parvae, omuino 

 contiguae ; valva postica iufundibuliformis ; mucro retrojectus terminalis ; la- 

 minae ut inKatherina sed obsoletim fissatae ; zona Acauthochitouoidea. - Type: 

 Ch. strigatus Sow. 



Chitoniscus Carp. - - Animal et testa Choneplacis similes, sed zona hand porifera. 

 Type: Ch. striatus Sby. 



Chiton L. 



Ch. (Ischnochiton] imitator Smith ( 2s3 ) in Proc. Zool. Soc. 1881. p. 35. pi. 4. Fig. 

 13 13c, from Tom Bay, Patagonia. 



Ch. (Lophyrus) Senegalensis Rochebrune ( 266 ) in Journal de Conchyliologie p. 42 ; - 

 (Loph.} sicuhis forma africana, ibid. p. 42, beide von Seuegambien ; - - Ch. (Lep- 

 tochiton] Sererorum , ibid. p. 43, von der Bank von Arqniu ; - : Lept.} Cessaci, 

 ibid. p. 43, von Senegambien und den Inseln des gritnen Vorgebirges; - - Ch. 

 [Tonicia] Gambiensis , ibid. p. 43, vom Cap St. Marie; Ch. (Acanthopleura 

 Quatrefagesi, ibid. p. 44, vom Cap; - - Ch. [Acanthochites] Dakarieiisis, ibid. p. 44. 

 von Dakar; - - Ch. (Acanthoch.} Adansoni, ibid. p. 44, von Senegambien und den 

 Inseln des grtinen Vorgebirgs : - - Ch. (Acanthoch.} Bouvieri, ibid. p. 45, von eben- 

 da; - - Ch. (Acanthoch.} Joallesi, ibid. p. 45, von Senegambien. 



Hartley ia Gray. 



Hani, tropicalis Dall ( 7!l ) in Bull. Mus. Cambridge Vol. 9. p. 53 , von Sand 

 Key, 128 fms. 



Lepidopleurus Crp. - - L. Campbelli Filhol ( 105 ). in Comptes rend. T. 91. p. 1095, 

 von den Campbell-Inseln. 



6* 



