36 



middle ; the relative measurements of this leg are: merus 2, carpus 1, propodus 1,1, while the 

 dactylus measures two-fifths of the propodus. As regards the relative measurements of the 

 antennular peduncle, the carpocerite and the scaphocerite, also as regards the peraeopods of 

 the four posterior pairs A. acuto-femoratus much resembles A. consobrinus de Man, but when 

 the specimen from Stat. 1 1 5 is compared with the ova-bearing female of A. consobrinus described 

 below, I observe nevertheless some differences. Of A. consobrinus the basicerite is unarmed. 

 In a lateral view of the carapace the interocular part of the rostrum appears in this female 

 of A. consobrinus distinctly convex, curved and hardly or not concealed by the eyes, in the 

 specimen of A. acuto-femoratus, however, the interocular part appears in this view situated 

 behind the eye, running nearly straight downward. The telson shows somewhat different 

 measurements. In the specimen of A. aczito-femoratus the 2 nd carpal segment of the 2 nd peraeo- 

 pods is almost 3-times as long as the i st , in the full-grown female of A. consobrinus, however, 

 little more than twice as long (de Man, 1. c. 191 1, p. 362) and in the young female, described 

 below, even only a little more than one and a half. The most striking differences between the 

 two species are, however, presented by the two chelipeds. 



27. AlpJicus consobrinus de Man. 



Alpheus consobrinus J. G. de Man, Siboga Exp., Monogr. XXXIX a\ Part II, Family Al- 

 pheidae, 191 1 (text), p. 360, 191 5 (plates), PI. XVI, fig. 75 — 75/. 



Stat. 213. September 26 — October 26. South-Island near Saleyer. Reef. 1 egg-bearing female. 



This specimen is only 9,3 mm. long from apex of rostrum to tip of telson and fully 

 agrees with my description. The rostrum reaches almost to the middle of the visible part of 

 i st antennular article, the 2 nd article is hardly longer than that visible part of i st . Basicerite 

 unarmed. In a lateral view the rostrum runs obliquely downward, rather much, with the acute 

 tip slightly i;urned upward. Telson 1,5 mm. long, anteriorly 0,76 mm. broad, distance between 

 the postero-lateral angles 0,53 mm. 



Outer surface of the merus of the larger cheliped (on the right side) twice as long as 

 broad, acute tooth at the inner margin well-developed. Looked at from the outer (upper) side 

 the large chela proves to be 3,2 mm. long, the palm 1,12 mm. thick, proportion 2,8; when, 

 however, the lower (outer) side is looked at, the chela resembles Fig. 72*? on Plate XV of 

 my work, the palm being higher with regard to the height of the fingers than in the male 

 (PI. XVI, Fig. 75 c), while the lower but especially the upper border appear more strongly 

 curved. Merus of the small cheliped 2Y 3 -times as long as broad, measured on the outer side ; 

 internal margin unarmed. Carpus almost twice as long as broad distally. Viewed at from the 

 upper side (as in Fig. 75^) the chela proves to be 3,5-times as long as broad proximally, 

 while the palm is in proportion to the fingers as 13 to 10, exactly as in the adult female 

 from Stat. 315 described by me in 191 1. Palm presenting only a few setae on the inner 

 side near the upper border. 



Carpal segments of the 2 nd legs long 0,38 mm., 0,62 mm., 0,22 mm., 0,22 mm. and 

 0,36 mm., chela long 0,72 mm. (palm 0,34 mm., fingers 0,38 mm.); these numbers prove that 



