>. K I STACEA MALACO8TRACA. IV. u 



Distribution. The type was taken off Portugal at I. at. j87' N . Iong. q"i8' \V . 550 fath. (G. O. 

 Sara). Caiman recorded it from a place off the I'n. States: Lat. 40 ift'so" N.. Ix>ng. 67"oV 15" \V.. 1290 fath.. 

 and from stations in the Mediterranean near Capri, 504 to 6.17 fath. 



7. Leucon spiniventris n. sp. 

 (PI. I. figs. 3a jd). 



Female (adult and subadult). Allied to /.. longirostris G. O. S., but very distinct. Carapace with 

 pseudorostnim atxmt 4 times in total length; more than the |>osterior half of the dorsal crest is feebly curved, 

 nearly horizontal, while its anterior part curves gradually considerably downwards and is armed with 2 tri- 

 angular teeth very* distant from one another, and the anterior somewhat t>ehind the end of the frontal lobe; 

 the anterior tooth is moderately large, the posterior one considerably larger; the lateral surface of the frontal 

 lobe without any tooth. Pseudorostnim is a little more than '/ of the total length of the carapace, directed 

 considerably upwards and tapering from near the base to the subacute end ; its upper margin has the posterior 

 half a little concave, while the lower margin has towards the base 2 distinct teeth and i rudimentary tooth. 

 The antenna! notch is regularly and somewhat flatly concave without any incision or tooth. The antero-lateral 

 angle of the carapace is slightly produced and equipped with a strong tooth, behind which the lower margin 

 has about 12 teeth. The pleural plate of the antepenultimate thoracic segment has its infero-posterior angle 

 produced into a slender tooth turning downwards; the last thoracic segment has on the anterior half of its 

 lower side two pairs of spiniform processes (rig. 3 c) directed downwards and forwards. The abdomen is rather 

 robust and a little longer than the cephalothorax ; its first segment has below a pair of procurved, spiniform 

 teeth (fig. 3c). 



The anteunube are moderately long ; second joint of the peduncle is very thick, third joint much more 

 slender, through still robust. The outer flagellum 3-jointed; first joint almost as long as the third joint of the 

 peduncle, and distinctly longer than second joint; the inner flagellum is a rather thick, subconical joint 

 with the end obtuse, and it is somewhat shorter than first joint of the outer flagellum. Third maxilli|>eds 

 without any conspicuous tooth on fourth or fifth joint. First thoracic legs without teeth on the lower side 

 of second joint; the propodus is a little longer than the carpus and considerably longer than the terminal joint. 

 Second legs with the distal joints very robust; carpus nearly as long as the two following joints combined. 

 Fourth legs at least in the immature female (fig. je) with a spine directed forwards and somewhat upwards 

 on the antero-interior side of second joint somewhat from its base. -- The uropods (fig. 3d) are a little 

 shorter than the two distal abdominal segments combined. The peduncle in the adult with about 7 spines 

 on its inner margin. The endopod is as long as the peduncle: its proximal joint at least five times as long as 

 the distal joint which terminates in a strong, somewhat curved spine longer than the joint ; this distal joint lias 

 4 or 5 spines on its inner margin, while the proximal joint has in the adult about 17 spines; among the 8 

 spines on its distal fourth 3 are long and strong, while 5 are rather short; in the immature specimen 14 or 

 15 spines were observed on the proximal joint. The exopod is considerably shorter than the endopod. 



Length of a female with brood in the marsupium 7 mm. 



