COLLECTED BY CAPTAIN TOYNBEE. 1ST 
This species is at once distinguishable from all the others at present known, by the 
posterior angle of the back being toothed. In general outline it resembles the other 
species ofConckoecia s but is deeper behind instead of in front. 
The anterior antennae resemble those of Halocypris atlantica in the form and arrange- 
ment of the setae; the spiculum, however, is longer than the antenna by its whole head. 
The mandibles and first pair of maxillae are not unlike those of Halocypris atlantica 
(Trans. Ent. Soc. n. s. vol. iv. pi. 12. f. 5 & 6). 
The shell is reticulated but very faintly; and the two valves are similar in outline. 
Length x^th of an inch. 
Collected April 21 and June 7. S. lat. 0° 40'; W.long. 0° 20'. 
N. lat. 7° 15' ; W. long. 27° 52'. 
. S. lat. 13° 43'; W. long. 33° 55'. 
Pl. XXIX, fig. 26; x 30 ; fig. 27. anterior antenna, x 30 ; fig. 28. posterior antenna, x 30. 
Conchcecia intermedia, n. s. Superne visa ovata, antick rotundata elliptica, posticc 
subacuta; latere visa oblonga, subrectangulata, fronte instar rostri product;), dorso 
fere recto, angulo postero acute rectangulato. Spiculum fere cylindricum, antenn& 
plus dimidio longius. Antennarum secundarum articulus secundus duplo longior 
quam ultimi simul sumti. Pes mandibularis articulo secundo elongato, faribus 
ultimis non inflexis, vix attenuatis. 
This species possesses the general outline of Conchcecia, with an almost cylindrical 
spiculum and short setae to the first pair of legs. Prof. Dana gives the flexure of the three 
terminal segments of the mandibular palpus as a generic character. Although, however, 
it is true that they are generally bent down, this is not always the case. Moreover their 
base is provided with two strong muscles — a flexor and an extensor ; so that they must 
have considerable play ; and I have represented a specimen (PI. XXIX. fig. 15) in which 
they are as little bent as is the case in Halocypris, which also has the two muscles, and 
must therefore have the power of bending the three terminal segments. 
The present species, again, though in general outline it resembles the typical species of 
Conchcecia, differs from it in having the spiculnm cylindrical ; and the palpus of the man- 
dibles is at any rate not always inflexed. 
The anterior antennae resemble those of H. atlantica', but the spiculum is longer than 
in that species. 
The five seta- of the appendage to the second antennae are all elongated, as usual ; 
but their appearance is peculiar ; and I am uncertain whether they are perfect or not, as 
they scarcely taper at all and yet do not look as if they had been broken off. The same 
remark applies also to the setae of the anterior antennae. 
The terminal seta? of the first pair of legs are rather short, as in Halocypris. The two 
valves are similar to one another. 
The shell is not latticed. 
Length «f -th of an inch. 
Collected May 3, in S. lat. 0° 40', W. long. 0° 20'. 
p L. XXIX. fig. 30,X30. 
