igi6.] S. Kemp : Notes on Crustacea Decapoda. 377 



there is a marked difference between the two in the sculpture of 

 the second abdominal somite. In A. propensalata, on either side 

 of the middle line, there is a broad sinuous ridge which extends 

 obliquely throughout the length of the somite. In A. pennata 

 this ridge is broken in two by a deep vertical furrow. 



Dr. Caiman has kindly sent me the following notes regarding 

 the types obtained by the ' Challenger ' — " The three specimens 

 of P. pennata differ among themselves in the form of the rostrum 

 and other characters. In two specimens the rostrum is relatively 

 short, bifid at tip, and with the lateral spines as large as in ^. 

 medium. In the third specimen the rostrum is longer, sharp-point- 

 ed, and with very small lateral spines. In this last specimen also 

 there is a tendency towards a softening of the inequalities of the 

 general surface, i.e. the keels and ridges are not so prominent. 

 In particular the two lobules on either side of the median carina of 

 the second abdominal somite are not sharply defined, although 

 the vertical furrow separating them is distinct." 



The following records of occurrence in Indian waters may be 

 added to those given by Alcock : — 



4_a_ti Persian Gulf, 26°2o'3o" N.. ^4°52'3o" E., 



35 fms. ... ... ... 'Investigator' Five. 



^%^ Persian Gulf. 26°33' N.. 52°23' E., 



40 fms. ... .. ... .. One. 



i-Vo-^ Arabian Sea, 24°26'5o" N.. 66°35'5o" E., 



35 fms. ... ... ... ,, Seven. 



^-\^^ Coromandel coast, i4°25' N., 8o°i5'45" 



E., 12 fms. ... ... ... ,. Two. 



liOL-_S. 2037-9 j 



2 3 9. T-4.o j.. Vls_7-92_ 1 Ganjam coast, 26-93 fms. " Twenty-two. 



W-S 28 rai.^S.W. of Puri. Orissa, 25 fms. ... ,, Three 

 ^V-^' Off Gangetic delta, 2o°i8' N., 90=50' E., 



65 fms. ... ... . . ,, One. 



^y^j" Off Tennasserim coast, i3°27'3o" N., 



97°37' E , 50 fms. ... ... ,, Two. 



iLU'o Off Cheduba. Arakan coast, 20 fms. . .. One. 



According to the labels the individual from the neighbourhood 

 of the Gangetic delta was '• grey, touched with dark brown and 

 green marks", while some of those from the Ganjam coast were 

 irregularly banded with lichen green and mottled pink. 



On the Indian coasts A . pennata is evidently common ; it has 

 been found at depths ranging from 12 to 93 fathoms. The type 

 specimens were obtained by the ' Challenger ' in the Arafura Sea, 

 south of New Guinea, 8° 56' S., 136° 5' E., at a depth of 49 fathoms. 

 Balss, under the name A. obsoletum, records numerous specimens 

 from Japan from depths of 80 to 150 metres. The species is ap- 

 parently one of wide Indo-pacific distribution. 



Aegeon propensalata (Bate). 



1888. Pontocaris prupejisalata. Bate, Rep ' Challenger ' Macfiini, p. 46;, 



pi. xc, figs. 2, 3 ; pi. l.xx.w, fig. 5. 

 1895. Pontocaris propensalata, Ortmann, Proc. Acad. Sci. Philadelpliia. 



P- 175 



