230 WALTER GARSTANG. 



also inapplicable iu regard to the form of tlie frontal margin. 

 My figure (PI. 14, fig. 5) does not indicate the median orbital 

 emargination as deep as is actually the case. 



Stimpson's descriptions (1858, p. 230) of the genera Al- 

 bunsea (sic) and Lepidopa (sic) render the identity of the 

 two forms still more improbable, owing to the characters of 

 the antennal acicnlum and of the carpal lobe of the third 

 maxillipeds which I have described for ray specimen. These 

 characters are such as also exist in the species of the restricted 

 genus Albunea, from which Stimpson removes the species 

 scutellata. On these grounds, therefore, I refer my speci- 

 men to a new species of Albunea, distinguishable from the 

 other known species by the character of the carapace-sculpture, 

 frontal margin, optic plates, and telson. 



On the other hand, Milne-Edwards' figure is clearly bad 

 (note the absence of any distinction between the abdominal 

 tergites and their lateral lamellate expansions) ; and it is 

 possible that if his (or Desmarest's) specimens could be re- 

 examined, some, if not all, the distinctions upon which I have 

 relied would vanish. If the form of the ocular plates is de- 

 termined in this genus, as I have rendered probable in the 

 preceding paper, by their opercular relations to the prostomial 

 chamber ; and if the emarginations of the frontal area are 

 functionally correlated with the play of the optic peduncles, 

 antennules, and antennae, as appears to me to be the case after 

 examination of three species of Albunea; then it is perfectly 

 clear that Milne-Edwards' fig. 9 does not correctly represent 

 his specimen iu these respects. 



Bibliography. 



Alcock, a. (1896). — " Materials for a Carciuological Fauna of India " 

 No. 2, "The Bracliyura oxystoma," ' Journ. Asiatic Soc. Bengal,' 

 Ixv, pt. ii, No. 2, pp. 134;— 296. 



Dana, J. D. (1852).— "Crustacea," 'U.S. Exploring Expedition, 1838— 

 1812,' vol. xiii. 



