171 



The external maxillipeds that bear a well-developed exopodite, extend to the distal third 

 or fourth of the antennal scale and the legs of the i st pair are but little shorter. Shorter leg of 

 the 2 m1 pair either on the right or on the left side. The peraeopods of the 3 rd pair (Fig. 42 d, 42/ 

 and 42/1) are nearly as long as the antennal scales, while the following become gradually a little 

 shorter. The dactyli of the 3"' pair measure in adult specimens (lig. 42c, 42^), both male and 

 female, a little more than on e- third of the propodi, in young individuals (Fig. 42/) 

 ■of which the carapace is 23 mm. long, even slightly more than two-hfths; they are almost 

 6-times as long as broad at base and armed along the proximal half of their posterior margin 

 with 4 or 5 rather stout spinules that slightly increase in length from the i st or proximal to the 

 last. So e. g. in an adult male from Stat. 12 the propodus of the 3 rd legs is 10,5 mm. long, 

 the dactylus 3,8 mm. long and 0,68 mm. broad at base, in an adult ova-bearing female from 

 the same Station these numbers are, in the same succession, 10,8 mm., 4,1 mm. and 0,7 mm., 

 in a young individual, finally, from Stat. 74, of which the carapace is 23 mm. long, j j mm., 

 3,3 mm. and 0,48 mm. 



The female from Stat. 3 1 6 proves that this species is already provided with eggs, when 

 it still only measures 1 10 mm. 



T a b 1 e of Measurements in millimeters. 



Carapace . 

 Rostrum . 



Formula . 



Carapace 

 Rostrum 



Formula 



Carapace 

 Rostrum 



Formula 



N° 1—8 Stat. 12, N" 1 — 3 males, N° 4 — 7 ova-bearing females, N° 8 female without 

 eggs-, N° 9 — 16 Stat. 38, all young; N° 17 — 22 Stat. 74, N° 17 ova-bearing female, N° 18 adult 

 male, N° 19 — 22 young specimens; N° 23 — 26 Stat. 139, N" 23, 24 adult males, N° 25, 26 

 ova-bearing females; N IJ 27 and 28 females from Stat. 212, the latter with eggs-, N° 29 — 36 

 Stat. 256, N° 29 — 31 males, N" 32 — 34 females with eggs, N° 35 and 36 females without eggs 

 (N° 31 bears a Bopyrid in the left branchial chamber); N° 37 egg-bearing female from Stat. 262; 

 N° 38 egg-bearing female from Stat. 316. 



8. Heterocarpus dorsalis Bate. PI. XV, Fig. 43 — 43^. 



Heterocarpus dorsalis C. Spence Bate, Report Challenger Macrura, 1888, p. 630, PI. CXI. 

 ? Heterocarpus Alphonsi C. Spence Bate, 1. c. 1888, p. 632, PI. CXII, fig. 1. 



