COLLECTED BY CAPTAIN TOYNBEE. 187 



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 oiConchoecia, but is deeper behind instead of in front. 



The anterior antennae resemble those of Saloci/j^rls atlantica in the form and arrange- 

 ment of the setse ; the spiculum, h(jwever, is longer than the antenna by its whole head. 



The mandibles and first pair of maxillae are not unlike those of ILalocypris 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 xotli of ^^ 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. postei'ior antenna, x 30. 



CONCHCECIA INTERMEDIA, n. s. Superne visa ovata, antice rotundata elliptica, postice 

 subacuta ; latere visa oblonga, subrectangulata, fronte iustar rostri producta, dorso 

 fere recto, angulo postero acute reetangulato. Spiculum fere cylindricum, antenna 

 plus dimidio longius. Antennarum secundarum articulus secundus duplo longior 

 quam ultimi simul sumti. Pes mandibularis articulo secundo elongate, tribus 

 ultimis non inflexis, vix attenuatis. 



This species possesses the general outline of Conchoecia, 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 JLalocyims, 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 

 Conchoecia, differs from it in having the spiculum cylindrical ; and the palpus of the man- 

 dibles is at any rate not always inflexed. 



The anterior antennse resemble those of H. atlantica ; but the spiciilum is longer than 

 in that species. 



The five setae of the appendage to the second antennae are aU 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 setae 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 -^oih of an inch. 

 Collected May 3, in S. lat. (f 40', W. long. 0° 20'. 

 Pl. XXIX. fig. 30,x30. 



