1913. | S. Kemp: Crustacea Stomatopoda of the Indo-Pacific Region. 57 
thoracic somites. The posterior half of the fifth abdominal somite between the marginal 
and lateral carinae and the outer posterior angles of the sixth somite are black. 
The only differences that I have been able to detect between the specimen which 
Fukuda has described under the name of Sguwilla quadraticauda and the type of S. 
boops are that in the former example the rostrum is more triangular in outline, the 
intermediate carinae of the second and the lateral carinae of the first abdominal somites 
do not end in spines, and the submedian pair of marginal spines of the telson are more 
divergent and the intermediate pair more convergent. Also, according to Fukuda’s 
figure, the anterior margin of the ophthalmic somite is not pointed in the Japanese indivi- 
dual, the antennular peduncle is longer and the teeth of the raptorial dactylus shorter. 
Fukuda’s specimen is much smaller than that from Indian waters and some of the 
differences noticed may be merely growth-stages. The Japanese example may possibly 
represent a distinct variety, but there can be little doubt that both individuals must 
be referred to a single species. 
ui Gulf of Martaban, Burma; 67 fms. 14°26’ N., 96°23’ E. ‘Investigator. 19,8q9mm. TYPE. 
The example described by Fukuda under the name of S. quadvaticauda is a female, 
40mm. in length. It was obtained at Matsuwa, Sagami Province, Japan. 
THE SPECIES OF THE S. NEPA GROUP. 
This group may be briefly defined as containing those species of Sguwil/la which 
have a series of fine pectinations along the upper edge of the propodus of the raptorial 
claw, six teeth on the raptorial dactylus (including the terminal one), bilobed lateral 
margins to the fifth and sixth thoracic somites and eight longitudinal carinae on the 
first five segments of the abdomen. 
Until comparatively recently all the species which agreed in the above characters 
were included under a single specific name, Sgwilla nepa. Bigelow, however, in 1894, 
redefined Berthold’s S. affinis (=S. oratoria, De Haan) and pointed out the features 
by which it might be distinguished from S. nefa. Shortly afterwards two other species, 
S. foveolata and S. stridulans, were described by Wood-Mason and during the last few 
years Nobili and Balss have insisted on the claims of Kossmann’s S. massavensis to 
specific recognition. 
But even now, the characters of some of the forms are very imperfectly known, 
and in examining the material at my disposal I have been led to describe three new 
species and one new variety, all of which appear to be far from uncommon in Indo- 
pacific waters. Fortunately, I am able to introduce these new forms with a very con- 
siderable degree of confidence. This is due in the first place to the large and valuable 
series of specimens in the Indian Museum and secondly to the numerous examples from 
other sources which I have been able to examine. In particular, mention must be 
made of the fine series kindly lent by the Trustees of the British Museum. This collec- 
tion, which contains numbers of specimens recorded by Miers, Brooks, Henderson and 
Pocock, has enabled me to trace the synonymy of some of the species in a way that 
