MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



25 



Fig. 24. 



Livoneca frontalis, a, Seventh leg, X 7£; b, female, X2; 

 c, male, X 4. 



articles and extend to the posterior margin of the head or to the end of the sixth article 

 of the second antennae. The second antennae are composed of twelve articles and 

 extend a little beyond the extremity of the first antennae. 



The first segment of the thorax is the longest, being 2 mm. in length. The following 

 six segments are subequal, each being about 1.5 mm. long. The epimera of all the 

 segments reach the postlateral angles of their 

 respective segments. 



The first five segments of the abdomen are sub- 

 equal, each being about 0.5 mm. long. The sixth 

 or terminal segment is about as long as wide, 5.5 

 mm. long: 6 mm. wide, and is posteriorly rounded. 

 The branches of the uropoda are subequal in length 

 and width and are 1 mm. shorter 

 than the terminal abdominal 

 segment. They are narrow, with 

 rounded extremities. 



The legs are all prehensile with 

 a rather high carina on the basis 

 of the last four pairs. 



Only two specimens, a male 

 and a female, were collected, at 

 Balistid, Sablayan. The male 

 differs from the female in having 

 a longer frontal process to the head, which is truncate, in having longer antennae 

 and longer uropoda. 



This species resembles somewhat Livoneca stewarti Filhol a and Livoneca raynaudii 

 H. Milne Edwards, & from both of which, however, it is distinct. Type specimen, cata- 

 logue number 40937, United States National Museum. 



Livoneca, sp.? 



One imperfect specimen of a species of Livoneca was collected at Jolo, on the 

 shore. 



Genus RHIOTHRA Schicedte and Meinert. 

 Rhiothra callipia Schicedte and Meinert. 



Rhiothra callipia Schioedte and Meinert, Nat. Tidsskr. (3) xiv, 1S83-84, p. 319-324, pi. xn, fig. 8-13. 

 Stebbing, Ceylon Fearl Oyster Fisheries Report, 1905, pt. iv, p. 26-27. 



Locality: One specimen, a female, from Mansalay, Mindoro. Taken while dyna- 

 miting fish on the reef. Schioedte and Meinert's specimens were from the Indian 

 Ocean, the islands of Mauritius and Palaos. 



The present specimen differs from Schioedte and Meinert's description of. the type 

 in having six articles to the first pair of antennae and eight to the second pair and in 

 having the inner branch of the uropoda slightly longer than the outer. 



PLEOPODIAS, gen. nov. 



Head slightly immersed in thorax. Eyes distinct. First pair of antennae with 

 first three articles large, dilated. First antennae long, extending to the middle of the 

 first thoracic segment. Second antennae long, extending to the middle of the second 

 thoracic segment. 



Thorax with epimera distinct on last six segments. 



Abdomen not abruptly narrower than the thorax but somewhat narrower and with 

 the segments, from the first to the terminal, gradually becoming narrower. Ter- 



alnstitut de France. Academie des Sciences. Passage de Venus sur le soleil du 9 Decembre, 1874. 

 Mission de Pile Campbell, t. in, pt. 2, no. 1, p. 450-451, pi. lv, fig 6. 

 b See Schioedte and Meinert, Nat. Tidsskr. (3), xiv, 1883-84, p. 367-372, pi. xv, fig. 9-13. 



