228 WALTER GAUSTANG. 



posal by Professor Laukester) of Albunea microps (both ^ 

 and ? ) in the Oxford Museum, labelled " Sulu Sea, H.M.S. 

 Nassau, 1871-3," and the accompanying description is derived 

 from an examination of this single specimen.^ 



Length of carapace, 9 mm. Sculpture on back closely 

 resembling that in A, microps, but readily distinguishable by 

 the following points : — The principal M-shaped transverse 

 line across the middle of the carapace is relatively more con- 

 spicuous in A. scutelloides, and the remaining transverse 

 interrupted step-like ridges are relatively much more nu- 

 merous (quite twice as numerous). They are consequently 

 more closely set and give the carapace a still rougher appear- 

 ance than in A. microps. Under a lens the ridges are seen 

 to have a minutely tuberculate or beaded character, which is 

 not seen in specimens of A. microps. 



Mid-frontal area emarginated, broadly concave, but the 

 emargination is wider than in A. microps, and therefore 

 appears less deep; provided with a median tooth, as in A. 

 microps, and a pair of small admedian teeth, as in the same 

 species. Antero-lateral margin (from the admedian tooth to 

 the antero-external angle of the carapace) divided into two 

 approximately equal halves by a sublateral prominence; each 

 half presents a slightly concave curvature. The inner and 

 outer halves of the antero-lateral margin correspond with the 

 bases of the antennules and antennae respectively, and may 

 therefore be termed the antennular and antennal curves. 

 Antero-lateral margin without teeth, but with twelve or thir- 

 teen minute close-set tubercles distributed along the anten- 

 nular curve and around the border of the sublateral promi- 

 nence (thus differing from A. microps). 



Antennules long ; each provided with two rows of hairs 

 which interdigitate with those of the other. Antennules pre- 

 senting a marked double bend at their basal joints. 



Antennae provided with an accessory joint (aciculus), as 

 long as the joint of the flagellum to which it is approximated, 



^ The type specimen of this species will be deposited by Professor Lankes- 

 ter in tlie British Museum. 



