336 Geoffrej^ Smith 



be mixed with L. merco utilis. There can be no doubt however 

 that the two are quite distinct thougb very closely allied species. 



L. mergellinae. — New speeies. — PI. 20, Figs. 24 — 28. 



Male. Lengtb 0.9 mm. Mouth parts degenerate as in preceding. 

 1'* antenna bas 8 joints, tlie proximal joints of flagellum beiug ratber 

 swollen: sensory bairs uumerous and long. Eyes well developed. 

 Cbelae very similar to tbose of L. mercantilis in every particular; 

 comb bas 1 1 bristles. Claws on Walking legs very long. Uropod 

 bas endopod of 4 joints, exopod of 2. 



Female. Readily distingnisbable from females of L. dubia and 

 mercantilis by tbeir small size and uropod, wbieb bas a 4-joiuted 

 endopod and 2-jointed exopod. 



Tbis species oceurs in no great abundance at Posillipo aud 

 Mergellina in ratber muddy material consisting cbiefly of tbe roots 

 of Posidonia Carolinü. It afifords a very beautiful trausition to 

 Paratanais Batei. 



Heterokmais. 

 H. anomalm (Sars) Q nov. (PI. 21 , Figs. 29— 35 . 



Male. Described by Sars (Middelbavets Saxisopoda). Cbela 

 brusb bas 1 1 bristles. 



Fem ale. 1.5 mm. long. At once distinguisbed from young 

 Leptochelia by tbe sbort and very stout P* antenna, tbe presence 

 of two joints in tbe exopod of tbe uropod and 4 joints in tbe endo- 

 pod. Tbe Joint of tbe cbeliped wbicb precedes tbe cbela bas an 

 overlapping lobe. 



DoHRN (9) discovered tbe male of tbis species, and as it occurred 

 mixed witb L. dubia and tbere appeared to be no iemale correspon- 

 ding to it, be suggested tbat it was Müller's low male of L. didm. 

 Sar.s found tbe male again but tbougb be did not discover tbe fe- 

 male, be believed on general grounds tbat it belouged to a sepa- 

 rate species. DoHRNS Suggestion must now he finally given up as 

 I bave found tbe oviferous female corresponding to tbe male, and 

 also tbe male and female of a similar closely allied si»ecie8. 

 H. nnomahis oceurs in very small numhers mixed up witb L. dahin. 



H. magmis. — New species. — PI. 21, Figs. 30—39. 

 Male. Lengtb 2.5 mm. Very similar to H. anomahis save in 

 size, but lirst antenna bas more joints, \iz. 13 as agaiust H), and 

 tbe cbela is more strongly developed, with 17 bristles in comb. 



