173 

 f i. Alpheopsis consobrinus de Man. 



J. G. DE MAN, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 305. 



Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- 

 point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 specimen. 



A new species closely related to Alph. acqualis Cout. Rostrum triangular, probably 

 acuminate, for in the only specimen which was collected, the extreme tip seems to be broken 

 off; the rostrum, as long as wide at its base, just extends beyond the fïrst antennular article 

 and is slightly directed downward. It is obtusely carinate above and appears in a lateral view 

 almost 3-times as long as high at its base. At either side of the rather broad and large rostrum 

 the frontal margin, which shows no tracé at all of extra-corneal teeth, soon curves downward 

 and slightly backward ; the pterygostomian angle is not rounded, but ends in a small, acute 

 tooth or spine, like in Alph. Chalciope. Viewed at from above, the large black corneae, 

 though reaching as far as the frontal margin, prove to be entirely covered by the carapace, 

 but in a lateral aspect the lower part of the corneae slightly projects beyond the antero-lateral 

 margin. Upper margin of the carapace straight, rounded. 



The straight lower margin of the fourth and the fifth abdominal pleura terminate 

 posteriorly in a minute, acute tooth ; those of the sixth somite are articulate, movable. Telson 

 5-times as long as the posterior margin is broad; width near the base twice as large as that of 

 the posterior margin. Posterior margin almost straight, hardly a little prominent in the middle, 

 with the outer angles acute, but not prominent ; longer internal spinules as long as the posterior 

 margin is wide, outer spinules one-third of the inner. Spinules of the upper surface almost half 

 as long as the posterior margin is broad ; the anterior pair immediately behind the middle of the 

 telson, the posterior a little farther distant from the anterior pair as from the posterior margin. 



Antennular peduncle as in Alph. acqualis Cout., var. truncatus Cout. (H. Coutière, Alph. 

 Mald. and Lacc. Archip. 1905, p. 869, Fig. 139^). Second article a little thicker or wider than 

 long, the proportion being as 17:15, and a little shorter than the visible part of basal article-, 

 third article one and a half as lono- as the second. Outer flagrellum consisting- of two articles 

 before bifurcation, the first of which is slightly longer than the second. Stylocerite acuminate, 

 almost reaching to the middle of third article. 



Carpocerite about as long as the scale of the scaphocerite, not longer ; the scale reaches 

 to the middle of third antennular article and is rather broad, while its outer margin is straight 

 and terminates in a spine, which, projecting straight forward, is half as broad at its base as 

 long and extends by one-fourth of its length beyond the scale. 



External maxillipeds as in Alph. Chalciope. 



The chelipeds resemble those of Alph. aequalis, the left is much larger than the right. 

 The short ischium, a little longer than thick, of the large cheliped bears a movable spine at 

 the apex of its upper border, which spine is but a little shorter than the joint. The merus is 

 rather short, its outer face is 2,8-times as long as broad at the truncate distal margin, where 

 it shows its greatest width, though it is almost as wide in the middle. The three margins are 

 unarmed at the apex, but on the outer face an obtuse crest or ridge runs from the 



46 



