33 Orust, 
CRUSTACEA. 
Scyllaridj:. 
Seyllarus and Arcius. Generic characters discussed by Boas, 1. c. 
pp. 85-87, pL iv. fig. 136 ; recapitulated, p. 181. 
Seyllarus haani (Sieb.), from the Aru Islands ; Miers, Ann. N. H. (5) v. 
p. 377. 
ERYONIDiE. 
Polycheles. Generic characters discussed by Boas, 1. c. pp. 94-96 ; re- 
capitulated, p. 185. According to him, it is identical with the fossil 
Eryon^ and Amphion is probably its larval form, pi. vi. figs. 201-203. 
Double eye in Pentacheles ; vide supra, “ Organs of Sense.” 
Polycheles sculptus, sp. n., S. F. Smith, P. U. S. Nat. Mus. ii. pp. 345- 
353, pi. vii., off the coast of Nova Scotia, 250 fath. 
Pentacheles validus, agassizi, and spinosus, spp. nn., A. Milne-Edwards, 
Bull. Mus. C Z. viii. pp. 65 & 66, West Indies, 118-1591 fath. 
Willemoesia forceps, sp. n., id. 1. c. p. 64, West Indies, 1940 fath. 
ASTAClDiE. 
Astacus (inch Camharus, Astacoidcs, &c.). Generic characters dis- 
cussed by Boas, I, c. pp. 76 & 77, pi. ii. fig. 51, pi. iii. figs. 86 & 110, pi. v. 
fig. 173 ; recapitulated, p. 178. 
Astacus. Huxley has published in French that part of his work, The 
Cray-fish,’* which concerns the arrangement of the gills, the classification 
and the geographical distribution ; Arch. Z. exp^r. viii. pp. 79-102, wood- 
cuts. A French translation of the whole book ; Paris : 1880. A German 
one : Leipzig : 1880, 8vo. 
Astacus fuvia tills found in some rivulets near Madrid, but unknown in 
the Douro, Tagus, and Ebro ; Holdsworth, P. Z. S. 1880, pp. 421 & 422. 
Astacus ftuviatilis nearly extinct in the province of Pavia by the influ- 
ence of the parasitic Vaginicola ; Maestri, Catalogo della Sezione Italiana 
dell’ Esposizione internazionale di Pesca in Berlino, 1880, p. 10. 
Camharus typhlohius, sp. n., from caverns in Carniola, nearly allied to 
pellucidus (Tel Ik.), from North America, announced but not described by 
Joseph, JB. schles. Ges. Ivii. p. 202. 
A tertiary fossil, Camharus primeevus, sp. n., from the fish-beds of the 
western part of Wyoming, A. S. Packard, Am.'Nat. xiv. p. 222, and Ann. 
N. H. (5) V, p. 435, may be mentioned, here on account of its near relation 
to the recent species, 
IJomarus: generic characters discussed by Boas, 1. c. pp. 68-72, pi. i. 
fig. 28, pi. ii. fig. 50, pi. iii. figs. 85 & 109, pi. iv. fig. 132, pi. v, figs. 147, 
164, & 172 ; recapitulated, pp. 174 & 175. Nephrops is very near it; id. 
1. c. pi. i. fig. 6, pi. iv. fig. 133, Astacus is regarded by the author as an 
intermediate link between Ilomarus and i\\Q' Thalassinidce. Homarus has 
nearer relations to the Peneidee than to the rest of the Carides, by the 
third pair of legs being also prehensile, and by the structure of the 
maxillipeds and maxillae. 
