PHYLLOPOD CRUSTACEA 



45 



tliunil) is aljijut half the length of the main branch of the finger as measured from the basal 

 spine to its tip. The dorsal process of the thumb is prominent. The dorsal row of spines 

 tends to run over onto the inner side of the main branch of the finger distally, and the sickle- 

 shaped branch of the finger is practically smooth along its concave edge. The legs of both 

 sexes have the epite serrate along the margin, and the gill of the last pair flattened, enlarged, 

 and finely serrate along the end. Length usually about 20 mm. or more. 



FiGURF. 8. — Strclttoccphahis. A, 5". simplex echinus, head from right side. A', same, from above. B, .5". s. 

 luiigimainis. head from right side. B', same from above. C, 5. j. (iraf'icH.y, head from right side. D,S.diclwtomus, 

 head frcjin right side. D' same, from above. (All X 8.1.) Side views of heads show right 2nd antenna cut away 

 to expose the frontal process; the cut surfaces are lined. Many of the differences other than the frontal processes 

 are the result of the condition of the material. The frontal process of S. s. simplex appears to be exactly like that of 

 .S'. dicluiliiinus. 



Streptocephalus simplex longimanus n. subsp. 

 Locality: Madras Presidency: Mahabalipuram. 2S, 39, coll. Hutchinson. 4-XI-32. 

 Types: Peabody Museum of Yale University. Paratypes to Professor Hutchinson. 



This subspecies differs sufficiently from S. s. simplex to make it seem worth while 

 to make the distinction. The terminal joint of the 2nd antennae of the 3 has a much 

 shallower and less inarked notch on the ventral side of the basal part of the finger. The sickle- 

 shaped branch of the finger has no basal spine. The main branch of the finger has the spines 

 on the dorsal edge very few (7-10), short and blunt. The thumb has no dorsal process, 

 though the dorsal groove is present, and the length of the thumb measured from the notch 

 on the distal side of the ventral process is actually greater than the length of the main branch 

 of the finger measured from the dichotomy. The 1st antennae of both sexes are long and 



