2ÓI 



f23. Synalpkeus Thcophane de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 292. 



Stat. 78. June 10/11. Lumu-Lumu-shoal, Borneo-bank. Reef. 1 egg-bearing female. 



Stat. 144. August7/9. Anchorage north of Salomakiëe-(Damar-)island. Reef. 1 egg-bearing female. 



Stat. 282. January 15/17. 8°25'.2S., 127° 18.4 E. Anchorage between Nusa Besi and the N.E.- 



point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 3 specimens, 2 of which 



with eggs. 



A new species of the Paulsoni group, closely related to Syn. tumidomanus (Paulson) and 

 to Syn. hululensis Cout. 



Rostrum in the female from Stat. 78 3-times as long as wide at its base, reaching but 

 a little beyond the middle of the visible part of first antennular article, of an elongate triangular 

 form ; lateral spines acuminate, but a little shorter than the rostrum, from which they are 

 separated by notches, similar to those of Syn. tumidomanus (vide: Coutière in: Proc. U. S. 

 Nat. Mus. XXXVI, 1909, p. 24, Fig. 5). In the female from Stat. 144, long 11,5 mm., the 

 rostrum appears a little more slender, almost 4-times as long as wide at its base and it reaches 

 to the distal fifth of the visible part of first antennular article ; the orbital spines are compara- 

 tively much shorter than in the preceding specimen, being one-fourth shorter than the rostrum. 

 In the largest specimen from Stat. 282, a female with eggs, 13,5 mm. long, the rostrum is 

 4-times as long as wide at its base and reaches almost to the end of basal article, while the 

 lateral spines hardly reach beyond the middle. The three spines project straightly forward and 

 are not curved upward at their tips. 



Antennular peduncle 4-times as long as wide (at the distal extremity of the second 

 article) ; median article a little longer than wide distally and a little more than half as long 

 as the visible part of basal article; third article as long or hardly shorter than second. The 

 length of the visible part of first article and that of the two following are in the proportion 

 as 5 : 3 : 3. In the quoted figure of Syn. tumidomanus (Paulson) the third article appears distinctly 

 shorter than the second, but the second hardly shorter than the visible part of the first. The 

 stylocerite extends to the distal third of median article. Carpocerite resembling that of Syn. 

 tumidomanus and Syn. huhilensis, 4,3 — 4,5-times as long as wide and surpassing the antennular 

 peduncle by one-third the distal article. Terminal spine of scaphocerite not or hardly curved 

 inward, always reaching for a short distance beyond the carpocerite and projecting by one- 

 third of its length beyond the apex of the antennal scale which almost reaches to the tip of the 

 antennular peduncle. Lateral spine of the basicerite a little longer than the outer margin of 

 the basal part, clearly shorter than the stylocerite, and reaching only to the 2 nd fourth part 

 of median antennular article ; upper angle with a well developed spine, which is directed obliquely 

 upward, its length being one-fourth the length of the lateral or inferior spine. 



The measurements of the telson are indicated in Table A. The posterior margin is more 

 prominent than in Syn. tumidomanus, almost se micir cular, the outer angles are spiniform, 

 as in this species, but shorter, only half as long as the outer spinules of the posterior margin; 

 the longer, inner spinules of the posterior margin are just half as long as the distance between 

 the spiniform, outer angles. Ouite characteristic is the arrangement of the spinules on the upper 

 surface, that are of moderate length, those of the anterior pair 0,175 mm. long, those of the 



129 



SIBOGA-EXPEDITIE XXXIX a'. 34 



