Crustacea Decapoda and Stomatopoda. 293 



I have recently given some notes on the species and races of this genus and have 

 pointed out that the form inhabiting Australia is not, as was hitherto supposed, 

 con specific with that found in Japan. The information I have been able to give 

 regarding the two races found in the latter country is, in the main, derived 

 from material obtained by Dr. Annandale. 



Paratya compressa (de Haan). 



1917. Paratya compressa, Kemp, Rec. Ind. Mus., XIII, p. 296, text -figs, i a-f. 

 The typical form of this species was found in abundance by Dr. Annandale 

 among weeds and dense vegetation at Komatsu and in pools and backwaters round 

 Lake Biwa ; in the lake itself it was much scarcer. Other specimens are from Ogura 

 and Yodo ponds near Kyoto. The Temnocephaloid worm Caridinicola was present in 

 the gill-chambers of a large proportion of the individuals examined at Komatsu. 



subsp. improvisa, Kemp. 



1917. Paratya compressa, subsp. improvisa, Kemp, Rec. Ind. Mus., XIII, p. 299, text- 

 figs. 2 a-f, 3. 



The race differs from the typical form in certain well-defined rostral characters. 

 Judging from the material examined it is restricted to the north-eastern parts of the 

 main island, while the typical form inhabits the south-western regions. The 

 boundary between the two races appears to be just to the north-east of Lake 

 Biwa. 



The specimens I have examined are from the lagoon Kasumi-ga-ura in Hikachi 

 province, collected by Dr. Annandale ; from Tokio, collected by Hilgendorf (Berlin 

 Mus.) ; from Lake Haruna, near Ikao, about 3000 ft., collected by Dr. K. Nakazawa 

 and from Lake Suwa, in the Shinano province, 2660 ft., collected by Dr. T. Kawa- 

 mura. 



Tribe PENAEIDEA, 



Family PENAKIDAE. 



Subfamily PENAEINAE. 



Penaeus indicus, Milne-Edwards. 



var. merguiensis, de Man. 



1906. Peneus indicus var. merguiensis, Alcock, Cat. Indian Decap. Crust., Ill, i, p. 13, pi. ii, 



fig- 4- 

 1911. Penaeus merguiensis, de Man, Decap. ' Siboga ' Exped., Penaeidae, p. 104, and {igi^), 

 pi. ix, figs. 33 a-c. 



Two specimens obtained by Dr. Annandale in Lower Siam are referred with some 

 doubt to this form. The principal distinction between typical indicus and the variety 

 merguiensis rests in the comparative length of the terminal segment of the third 

 maxiUipede of the male, and both the specimens in the collection are female. 



In the larger individual, which is about 120 mm. in length, the rostrum is 

 much elevated at the base, as in Alcock' s figure, and the foremost tooth on the upper 



