COLLECTED BY CAPTAIN TOYNBEE. 189 
IIAlocypuis rostrata, n. s. Superne visa elliptica, postice subacuta; latere visa lit era? 
D format similis, dorso fere recto, antice rostrato, postice rotundato. Antenna? antica? 
setis ina?quis. Spiculum cylindricuin, antenna vix longius. Antenna* postica? 7-ar- 
ticulata?, articnlo seenndo duplo longiore quam ultimi simul sumti. 
This species is nearly allied to H. brevsirostris ; and as my specimens were mostly rather 
smaller and the two were taken together, I was at first somewhat doubtful wh other the 
differences did not depend on age. The second segment of the posterior antennas is, how- 
ever, longer in proportion to the terminal portion — a difference which Prof. Dana considers 
of specific value (' Crustacea,' pp. 1302, 1303). Moreover some of the notched specimens 
were as large as H. brevirostris. The setae belonging to the longer branch of the posterior 
antenna? are plumose ; those of the two-jointed appendage are naked. 
There is an indication of a minute segment at the base of the long branch; and the 
terminal portion also seemed to consist of six segments rather than five. 
The spiculum is scarcely longer than the anterior antenna. 
The three terminal segments of the mandibular palpus scarcely diminish at all in 
breadth. The second segment is short and broad. 
The two valves are similar to one another in outline. 
The shell is latticed by longitudinal and transverse bars. 
Length -^th of an inch. 
Collected April 22, in S. lat. 0° 4Qf, W. long. 0° 20'. 
Pl. XXIX. fig. 33, x 30 ; fig. 34. mandible, x 30. 
Halocyphis Toynbeeana, n. s. Superne visa, brevissime ovata ; latere visa subrotun- 
data, lit era? D forma similis, dorso fere recto, angulis rotundatis, fronte obsolete 
prominula. Antenna? anticse 3-articulatae, setis nudis, uno longiore. Antennae portion 
9-articulata?, articulo secundo plus duplo longiore quam sequentes simul sumti. 
I have done myself the pleasure of calling this species after Capt. Toynbee, to whose 
industry and love for science we owe this valuable collection. It differs from H. infota 
in general outline, and in the posterior antennae. These latter are unlike those of any 
other species, in the arrangement and form of the large hairs belonging to the little ap- 
pendage ; these are six in number : four of them are simple and naked ; one is longer, 
and clubbed at the end ; and the other is thick, and bent upon itself in the form of a sickle. 
The larger branch of the antenna is 8-jointed, and the hairs belonging to it are plumose. 
The mandibles are like those of S. inflata in form, but differ a little in the arrangement 
of the hairs . • 
The two pairs of maxilla? and of legs offer no very striking peculiarities. 
Length -^th of inch. The animals were very active. 
Collected June 25, in S. lat. 0° 40', W. long. 0° 20'. 
A collection made in N. lat. 7° 15', W. long. 27° 52', contained some specimens agreeing 
very closely with this species, except in wanting the recurved spine on the appendage of 
the second pair of antenna?. This may perhaps be a sexual difference. , 
37 
fig. 38. man- 
dible, x 30 ; fig. 39. carapace, x 30. 
XXIII 
2C 
