— 14 — 
PHAKELLOPLEURA. 
Pallium unica serie pororum numero 18 fasciculos 
spiculorum vitreorum foventium, quorum 14 ad inser- 
tionem valvarum et cum valvis alternantes, et 4 circum 
valvam anticam. 
Sect. 1. Cryptoconchus Blainv. Gray. 
Valve subcordat®, nisi ad lineam dorsalem pallio-omnino immersx 
et obtecte; lamina insertionis valve antice circa 6-lobata, postic® 
5-lobata (lobi medii parvi), mediarum bilobata; pallium erassum leve, 
ad poros, a margine valde remotos, in tuberculis conicis elevatum. 
Species examinala. 
Chiton porosus Blainv. Nov. Zealand. 
Obs. Genus Amicula Gray, ex speciebus diversis sub nomine Ami- 
cule veslile confusis confectum, valde obscurum est, et vero- 
similiter inter sectiones priores distribuendum. Chitlon Emer- 
soni Coult. forsan at sectionem novam generis Plaxiphorse 
pertinet: Chiton vestilus Sowb. autem potius ad Chitonis sectio- 
nem Katharinam referendus; sed specimina mihi nondum obvia. 
Cf. Middendorf. 
Sect. 2. Acanthochites Leach. Gray. 
Valve cordiformes, profunde immers®, externe contiguz, sub- 
zwquales; lamina insertionis valve antiee 6-lobata, postice 5-lobata, 
mediarum bilobata; limbus dense spinulosus, poris spiculigeris con- 
spicuis. 
Species examinalte. 
Chiton Zelandicus Quoy. Nov. Zealand. 
» Garnotii Blainv. Ins. Canar. 
»  fascieularis L. Forbes et Hanl. Mar. Medit. 
„» discrepans Brown. Forbes et Hanl, | et Atlant. 
Chitonnellus strigatus Sowb. Ind. occ. 
Sect. 3. Chitonnellus Lam. 
Corpus vermiforme crassum. Valve profunde immers®, 4 ante- 
riores contigux, posteriores discrete, sensim angustate et diminute, 
triangulari-lanceolate; lamina insertionis valve antice 4-lobata, postic® 
et mediarum integra, cerassa; pallium crassum dense et minute spinu- 
losum, poris minutis inconspicue spiculigeris. 
