DECAPODA (mACRURA). 
Crust, 36 
(b) Autenuulaa triflagellate : Euryrrhynchus, Palce- 
rnonetes, Urocaris. 
Sect. 2. — Mandibles with a palpus. 
(a) Antennulae biflagellate : Palcumonella, Hymenocera. 
(b) Anteunulae triflagellate : Palcemon, • including 
Leander, Macrohrachium, and Bithynis ; Crj/phiops. 
4. — Subfam. [H]OPLOPHOKiNiE, first pair of periopods either didac- 
tyle or vergiform, second stouter, chelate ; anteunulae biflagel- 
lafce. [irjOplojdioj’us, Cauhu'us, including Xiphocaris^ and 
Thalassiocaris — lieyulus. 
A Ipheus ; generic characters discussed by Boas, 1. c. pp. 58 & 69, pi. vi. 
fig. 194. 
Alpheus wehsteri and packardi, spp. nn., Kingsley, 1. c. pp. 416 & 417, 
Key West. 
Alpheus macrochirus, sp. n., Richters, Decap. Maur. p. 164, pi. xvii. 
figs. 31-33, Mauritius. 
Alpheoides Imvis (Randall), and crassimanus (Heller), Red Sea ; Koss- 
mann, ^ool. Reis. ii. p. 81. 
Betoius utricola, sp. n., Richters, Decap. Maur. p. 164, pi. xvii. figs. 34 
& 35, Mauritius, on Moeandrina^ in bags built from Oscillaiorite. 
AtJianas mascarenicuSy sp. n., id. ihid.y third pair of maxillipeds rather 
long, Mauritius. 
Hippolyte : generic characters discussed by Boas, 1. c. p. 55, pi. ii. figs. 
76 & 77. 
Hippolyte spinus (Sow.), variability in the dorsal spines ; Miers, J. L. S. 
XV. p. 61. 
Hippolyte gairnardi (M.-Edw.), spina (Sow.), phippsi (Kroy.), and 
groenlandica (F. C. Fabr.) : specimens from Vancouver or Queen Char- 
lotte Islands mentioned, the; first and third partially described ; S. Smith, 
Rep. Geol. Surv. Canada, 1878-79, pp. 212 b-214 b. 
Hippolyte, sp. ?, from Mauritius, Richters, 1. c. p. 165, pi; xvii. fig. 30. 
Ogyris alphceirostris, sp. n., Kingsley, P. Ac. Philad. 1879, p. 420, 
pi. xiv. fig. 7, Virginia. 
Thor Jloridanus (Kingsley), autennula and mandible figured : id. 1. c. 
p. 421, pi. xiv. fig. 6. 
Pandalus {borealis, Kroy.) : generic characters discussed by Boas, 1. c. 
p. 57, pi. ii. fig. 78. 
Pandalus dance (Stimps.) and puhescentulus (Dana) ; notes on Van- 
couver specimens, by S. Smith, 1. c. p. 214 B. 
Pontonia. Generic characters discussed by Boas, 1. c. p. 54, pi. ii. 
fig. 46, pi. vi. fig. 193. 
Pontonia unidens, sp. n., Kingsley, 1. c. p. 422, pi. xiv. fig. 9, Key West. 
Pontonia {Harpilius) dentata, sp. n., Richters, Dccap. Maur. p. 165, 
pi. xvii. figs. 36-38, Mauritius. 
Anchistia petitthouarsi (Audouin, as P aloemo'n) — inaeguimana (Heller), 
Red Sea ; Kossmann, Zool. Reis. ii. p. 83. 
PalcBmonetes varians {hQ3iQh) common in freshwater lakes and ditches 
near Naples ; it lives in Southern Europe only in freshwater, but in 
