32 Crust . 
CRUSTACEA. 
only to the basal points of the terga, with its lower end truncated and 
very wide. M. striatum , sp. n., Philippine Archipelago, 100 and 115 
fatli., on the spines of an Echinus. Hoek, l. c. pp. 50-53, pis. ii. figs. 5-0, 
& vii. figs. 8 & 9. 
Dichelaspis sessilis , sp. n., id. 1. c. p. 48, pi. ii. figs. 10-12, Atlantic, near 
the Azores, 1000 fath. 
Alepas pedunculata , sp. n., id. 1. c. p. 57, pis. iii. figs. 1-5, & vii. figs. 
10 & 11, off New South Wales, 410 fath., on the spines of Phormosoma 
hoplacantha. 
POLLICIPEDIDiE. 
From the materials brought home by the ‘ Challenger,’ P. P. C. Hoek, l. c. 
pp. 98 & 09, traces the life-history of the males of Scalpellum as follows : — 
Either all species of Scalpellum, or at least those inhabiting the deep sea, 
have lost the Nauplius- as a free-swimming larval stage. After the meta- 
morphosis into the Cypris-stage, some of them become attached to the 
interior side of the scutum of a female species, near the occludeut mar- 
gin. Whereas in shallow-water species, these Cypris larvae develop into 
a small male animal, with a distinct capitulum and peduncle, in many 
deep-sea species they develop by retrogressive metamorphosis into a male 
of a much more rudimentary nature. Neither in the first nor in the 
second case is unisexuality observed in a stage corresponding to the 
Cypris-stage of the ordinary development. 
Scalpellum marginatum and ovatum , North of New Guinea, 2000 fath., 
japonicum, Japan, 565 fath., insigne , North Atlantic, 1525 fath., intermedi- 
um, off Sydney and Auckland, 410 and 700 fath., trispinosum, Philippines, 
82 and 102 fath., carinatum , Tristan d’Acunha, 1000 fath., recurvirostrum , 
Southern Indian Ocean, 150 fath., compressum, Celebes Sea, 2150 fath., 
acutum , North Atlantic and Australia, 520-1000 fath., breve-carinatum , 
Southern Indian Ocean, 1375-1600 fath., parallelogrammum , South 
Atlantic, 600 fath., album , South of Mindanao, 500 fath., africanum, near 
Tristan d’Acunha, 100 fath., hirsutum , Moluccan Sea, 825 fath., nympho- 
\ni\cola, North Atlantic, on the legs of Nymphon robustum (Bell), 540-640 
fath., rubrum , near Luzon, 100 and 115 fath., truncatum, New Guinea, 
1400 fath., elongatum , Tristan d’Acunha, Sydney and Auckland, 60-1100 
fath., antarcticum, Southern Indian Ocean, lat. 65° S., 1675 fath., velutinum, 
North and South Atlantic, 900 and 1425 fath., pedunculatum y New 
Zealand, 150 fath., eximium , off Tristan d’Acunha, 1000 fatli., gigas, Mid 
Pacific, 2050 fath., moluccanum , Banda Sea, 1425 fath., regium (Wyville- 
Thomson, MS.) with var. ovale, North Atlantic, 2750-2850 fath., dar- 
wini , capitulum about 46 mm., South Pacific, 2160 fath., distinctum, New 
Britain, 1070 fath., minutum , South Pacific, 1450 fath., abyssicola, North 
Pacific, 2050 fath., vitreum, Japan, 1875 fath., planum , South of Australia, 
2600 fath., australicum , between New Guinea and Australia, 1400 fath., 
tenue, near Crozet Islands, 1375 fatli., indicum, Banda Sea, 129 fath., 
tritonis , Faroe Channel, 316 fath., novce-zealandce , New Zealand, 700 fath., 
dubium, New Guinea, 1400 fath., jlavum, Southern Indian Ocean, 1375 
fath., balanoides , Banda Sea, 129 fath., and triangulare , South Atlantic, 
