GASTROPODA (CYCLOBRANCHIA, TECTIBRANCHIA). Moll. 55 
The known species from the Mediterranean (13) enumerated with their 
synonymy by N. Tiberi, Bull. Soc. mal. Ital. iii. [1877] pp. 136-145. 
Clathropleura^ subg. n. Margin of the mantle apparently reticulated ; 
Chiton Icevis (Penn.), corallinus (Risso), and sulcatus (Risso) = siculus 
(Gray) ; id. I c. pp. 136 & 143-145. 
Lopliyrus exaratus^ sp. n., G. O. Sars, Moll. arct. Norveg. p. 113, pi. viii. 
fig. 1, Norway, 100-200 fath. ; radula of it and of L. alhus (L.), id. 1. c. 
pi. i. fig. 8, & pi. ii. fig. 1. 
Lepidopleurus arcticus, sp. n., id. 1. c. p. 112, pi. vii. fig. 7, Finmark, 
20-100 fath. ; radula oi L. alveolus (Sars) and cancellatus (Sow.), id. 1. c. 
pi. i. figs. 7 & 8. 
Callochiton loevis (Penn.), radula; id. 1. c. pi. ii. fig, 6. 
Craspedochilus, g. n. for Chiton marginatus (Penn.) ; mantle beset above 
with small globose-conical non-imbricate corpuscles and fringed at the 
edge by long spines ; lateral plates of the radula tricuspidate, the median 
cuspid longer. Sars, Z. c. p. 114, pi. xx. fig. 16 ; radula, pi. ii. fig. 2. 
Leptochiton helknapi^ sp. n., Dali, Pr. U. S. Nat. Mus. 1878, p. 2, 
Alaska, 
Trachyflrfsia aleutica^ subg. & spp. nn., id. ibid.., Alaska. 
Tonicella saccharina, sp. n., id. ibid., Alaska. 
Boreochiton, g. n., for Chiton ruber (Jj.^ and marmoreus (Fabr.) ; mantle 
nearly smooth or beset with minute granula, without conspicuous mar- 
ginal spines ; lateral plates of the radula with hatchet-shaped, obsoletely 
3-toothed tip. Sars, Z. c. pp. 115 & 116, pi. viii. figs. 3 & 4 ; radula, pi. ii. 
figs. 3 & 4. 
{^tlanleya'] Chiton abyssorum (M. Sars) ; id. 1. c. pp. 109 & 343, pi. vii. 
fig. 4, & pi. xxxiii. fig. 3 ; radula, pi. i. fig. 6 : Stavanger, Norway, 150-200 
fath. Allied to C. hanleyi (Bean). 
Chlamydochiton^ subg. n., for Chiton amiculatus (Pull.), Dali. Pr. U. S. 
Nat. Mus. 1878, p. 1. 
Schizoplax, g. n., for Chiton hrandti (Middend.) ; id. 1. c. p. 2. 
Acanthochcetes fascicularis (L.), radula, Sars, Z. c. p. 117, pi. ii. fig. 6. 
Chiton (^Acanthochcetes') ceneus (Risso, 1826) = gracilis (Jeffreys, 1859}, 
and notes on the synonymy of other Mediterranean species of Chiton ; 
Monterosato, J. de Conch, xxvi. p. 147. 
TEGTIBRANOHIA. 
ToRNATELLIDiE. 
Actoeon tornatilis (L.), radula; Sars, Moll. arct. Norveg. p. 280, pi. xi. 
fig. 1 ; operculum, pi. xviii. fig. 57. 
Buccinulus intermedins, sp. n., Angas, P. Z. S. 1878, p. 862, pi. liv. 
fig. 11, South Australia. 
Ringicula. L. Morlet gives a monograph of this genus, containing 
historical and geographical notes, a description of the radula examined 
by P. Fischer and accurate descriptions and figures of 25 living species, 
including R. savignii (Descript, de I’Egypte, pi. vi. fig. 7), Red Sea, and 
folini, Singapore, spp. nn., J. de Conch, xxvi. pp. 113-133, pi. v. A 
