282 CEYLON PEARL OYSTER REPORT. 



Two specimens, both females, were found in the general washings from the dredged 

 Invertebrata. The short abdomen, the wide joints of 2nd maxillipeds, and the jointing 

 of inner branch of 4th pair of natatory legs readily distinguish this species. 



Paralichoinolg'us longicaudatus, n. sp. Plate XX., figs. 6 to 8. 



Length, female l'l millims. ; male unknown. 



Body sub-rotund ; 1st to 3rd joints of cephalothorax are pointed posteriorly and 



with a tooth on each lateral edge of 2nd and 3rd ; 4th joint very small. Abdomen 



about ^ the length of cephalothorax ; genital segment large and tumid ; the rest 



3 times broader than long. Furcal rami square, very short, with long terminal setae. 



. , , , . . 1. 2. 3. 4. 5. 6. 7. 8. 



Anterior antenna} 8-jomted, the proportional lengths being: - 



Posterior antennae, mandible, maxillipeds, and first 3 pairs and 5th pair of natatory 

 legs as in P. curticaudatus. The 2-jointed inner branch of 4th pair natatory legs 

 springs from middle of long basal joint at right angles ; the 3 joints of outer branch 

 being also at right angles to basal joint. 



One specimen only, a female, was found in the general washings from dredged 

 Invertebrata. The general appearance and the 4th pair of natatory legs clearly 

 distinguish this species from the last described. 



Hermannella arenicola, Brady. 

 Found in the general washings of dredged Invertebrata from the pearl banks. 



Hermannella robusta, n. sp. Plate XVII., figs. 1 to 8. 



Length of female l'l millims. ; male unknown. 



A very robust species with comparatively short abdomen. Anterior antenna? 



. . , ,. . , .. , . . 1. 2. 3. 4. 5. 6. 7. 



7-jomted; proportional lengths of joints : Y6~~ 3 5~~ 5 _ 16 - 8~ 6~^4 



The posterior antenna has a short stout hook-like spine arising from the 3rd joint. 

 Mandible and maxillipeds have a general resemblance to the corresponding organs in 

 Lichomolgus. Both branches of 1st to 4th natatory legs are 3-jointed. The 5th legs 

 are rudimentary. Abdomen with 4 segments; genital segment large and tumid, 4th 

 joint longer than the 3rd ; furcal rami about twice as long as broad, and slightly 

 longer than the last abdominal segment. 



This species is easily recognised by the robust body and short abdomen, which is 

 less than a fourth of the length of the body, and by the short furca. Three females 

 were found in the washings from Ceylon Invertebrates. 



Hermannella serendibica, n. sp. Plate XVIL, figs. 9 to 11. 

 Length of female, 1*16 millims. ; male unknown. 

 In general appearance more attenuated than H. robusta. Anterior antennae 



7-jointed ; proportional length of joints : ' ' ' ' Q ' ' ' 



