338 



but, as only one specimen was collected, later researches must decide whether the differences 

 are only individual or whether it belongs to a valid local variety: in the latter case the name 

 of huiparensis is proposed for it. The specimen from Lucipara-island is 15,5 mm. long. Rostrum 

 acute, narrow, twice as long as broad at its base and projecting horizontally forward to the 

 end of i^' antennular article; rostral carina not compressed laterally, slightly subacute above, 

 reachino- to the end of the orbital hoods from which it is separated by narrow, rather deep 

 o-rooves. Orbital spines, at the antero-external angles of the orbits, reaching to the middle of 

 the rostrum, projecting also horizontally forward, but distinctly inward, frontal margin at either 

 side of the rostrum slightly arcuate and running obliquely backward from the base of the orbital 

 spines to that of the rostrum. Corneae conspicuously faceted, a little less broad than the interspace 

 between them. In Heller's type from the Red Sea the rostrum is shorter, reaching only to 

 the middle of the visible part of i^' antennular article, but for the rest the orbital region is 

 the same. 



Telson 2,9-times as long (1,9 mm.) as its posterior margin is broad (0,66 mm.), greatest 

 width 1,9-times as wide (1,25 mm.) as the posterior margin; the latter slightly arcuate, postero- 

 lateral angles not prominent ; the longer spines on these angles are broken off, the outer are 

 0,16 mm. long. Upper surface of the telson rounded, lateral margins slightly arcuate; spinules 

 of the upper surface large, 0,2 mm. long, inserted twice as far from the median line as from 

 the lateral margins, anterior pair in front of the middle, 1,5-times as far distant from the posterior 

 margin as from the base, posterior pair a little farther distant from the posterior margin than 

 from the anterior pair. In Heller's type specimen the telson is 3-times as long (2,26 mm.) as 

 its posterior margin is broad (0,75 mm.), the greatest width (1,36 mm.) i,S-times the breadth 

 of the posterior margin; as in the specimen from Lucipara-island the posterior margin does 

 not show a dentiform prominence and Heller's description: "der Hinterrand in der Mitte 

 zahnartig vorspringend", proves therefore to be wrong; the longer, slightly curved, slender, 

 internal spines are 0,44 mm. long. The spinules of the upper surface are 0,26 mm. long, the 

 anterior pair inserted not so far forward, only 1,35-times as far distant from the posterior 

 margin as from the base. In Heller's specimen the movable spine at the postero-lateral angle 

 of the outer caudal swimmerets has a brown colour, in the specimen from Lucipara-island the 

 spine of the left exopod is black, while the other is missing. According to Heller the 

 2"<i antennular article should be one and a half as long as the i^' and the 3"' that are almost 

 equal : this now proved to be quite erroneous. In Heller's type specimen, indeed, the 2"'^ article, 

 almost one and a half as long as thick, appears even a little shorter than the visible part 

 of the i^', when the i^' is measured just near the base of the rostrum, and a little longer than 

 the 3'<J joint; the slender spine in which terminates the stylocerite reaches to the 2^^ third 

 part of 2""^ antennular article. 



In the specimen from Lucipara-island the 2"'' joint appears a little thicker, only 

 one-fourth longer than thick and it is not shorter, but as long as the visible part of the 

 i^', measured near the base of the rostrum; the 3"^ article is as long as the 2^^ and the 

 spiniform stylocerite reaches to the middle of 2^^ article. 



Basicerite armed, on the lower side though just near the outer angle, with a well-developed, 



206 



