BORRADAILE— ON THE PONTONIIN^ 355 



Genus Ancyclooaeis Schenkel, 1902. 



Verh. Naturf. Basel, xii. p. 503. Nobili, Bull. Sci. Fr. Belg. xl. p. 52 (1906). 



Definition : Body rather stout ; cephalothorax with dorsal swelling in female ; sixth 

 abdominal segment short ; rostrum deep, of moderate length, lanceolate, with about 

 half-a-dozen teeth above and one or two below ; eyes small ; outer flagellum of antennule 

 deeply cleft ; antennal scale broad ; mandible without palp ; second maxilliped with 

 or without podobranch*, and with last joint mediad of preceding joint; third maxilliped 

 slender, with arthrobranch ; legs stout, with short, simple, curved dactylopodites. 



The species of this genus are closely related, and the distinctions between them 

 are hard to gather from the published descriptions. Possibly some of them will 

 eventually have to be united. So far as can be learned from the diagnoses and figures 

 given by their authors, they differ in the points stated in the following key : 



Key to the species of Ancydocaris : 



I. Dorsal swelling of cephalothorax steep. Uncleft region of outer antennular 

 flagellum 8-jointed. Hepatic spine farther forward than usual. [Outer edge of antennal 

 scale converging towards inner. B. = ^ . Fingers of second leg gaping a little.] 



A. aberrans (Nobili), 1904. 



II. Dorsal swelling of cephalothorax gradual. Uncleft region of outer antennular 

 flagellum 5 — -T-jointed. Hepatic spine not farther forward than usual. 



A. All rostral teeth in front of orbit. Fingers of second leg gaping a little. 

 [B. = 1- Outer edge of antennal scale straight.] 

 A. latirostris (Lenz), 1905. 



One tooth of rostrum behind orbit. Fingers of second leg not gaping 

 appreciably. 



1. B. =f . Cephalothorax with large swelhng in middle of its length. Outer 



edge of antennal scale nearly straight f. Uncleft region of outer anten- 

 nular flagellum 7-jointed. 



A. hermitensis (Bathbun), 1914. 



2. B. =f. Cephalothorax with low swelhng in hinder region. Outer edge 



of antennal scale markedly convex. Uncleft region of outer antennular 

 flagellum 5 — 6-jointed. 



A. hrevicarpalis Schenkel, 1902. 



1. (Type.) Ancydocaris hrevicarpalis Schenkel, 1902. 



Verh. Naturf Basel, xiii. p. 568, PI. 13, fig. 21. 

 Macassar. 



* Nobili (Bull. Sci. Fr. Belg. xl. p. 52) very definitely states that A. aberrans has a gill on the second 

 maxilliped. I have not been able to find this in A. hermitensis. 

 t See below, p. 356. 



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