74 



Scyll. orientalis (Sp. Bate) is closely related to Scyll. Haanii Berthold and both species 

 form a small section of this genus, which is characterized by the media n carinae of the 

 a b d o m i n a 1 t e r g a b e i n g nowhere prominent o r projecting and b y the p r o- 

 podi of the 2 nd and 3 rd pairs of thoracic legs being compressed and broadened. 

 There are, however, several differences between both species. In Scyll. Haanii, which does not 

 reach the size of Scyll. orientalis, the orbits are situated nearer to the lateral margin of the 

 carapace, their diameter being more than twice or even 3-times as broad as their distance from 

 the lateral margin. The teeth of the median and of the sublateral ridges on the carapace are 

 s harp er. The abdominal terga and pleura are more conspicuously sculptured than 

 those of Scyll. orientalis: the smooth, anterior part of the terga, which is overlapped by the 

 preceding somite, is marked with two parallel, transverse grooves, while these 

 grooves are entirely wanting in Scyll. orientalis. The proximal antennal squame is constantly 

 armed only with two teeth on the outer and with o n e on the inner border. The 

 sternum of Scyll. Haanii is broader posteriorly, less deep and presents anteriorly also a different 

 form. Of Scyll. Haanii the thoracic legs are a little stouter. The colouration, finally, is different, 

 the i st abdominal tergum of Scyll. Haanii presenting three large win e-red spots, one in 

 the middle and one at either side (PI. II, fig. 10a). 



General distribution: Between Bohol and Zebu (Spence Bate); Bay of Bengal, 

 off Madras coast (Alcock); Arabian Sea, off Calicut (Alcock). 



3. Scyllarus Haanii Berthold. (PI. II, fig. 10 — ioaQ. 



Scyllarus Haanii A. A. Berthold, in: Nachr. Georg-Augusts-Univ. u. der kön. Gesells. Wiss. 



Göttingen, 1845, P- 45- 

 Scyllarus Haanii A. A. Berthold, Ueber verschiedene, neue oder seltene Reptilien aus Neu- 



Granada und Crustaceen aus China, in: Abhandlungen der kön. Gesells. der Wissenschaften 



zu Göttingen, Bd. III, 1847, P- 2 3> Tab. II, fig. 2, 3. 

 Nee: Arctns Haanii A. E. Ortmann, in: Zoolog. Jahrb. Abth. f. Syst. VI, 1891, p. 42 (pr. 



parte, Ex. a) and Bd. X, 1897, p. 271. 



Stat. 49a. April 14. 8°23'.5S., II9°4'.6E. Sapeh Strait. 70 m. Bottom: coral and shells. 1 



young specimen. 

 Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 



54 — 90 m. Bottom: fine grey sand ; coarse sand with shells. 3 males and 1 female 



without eggs. 

 Stat. 166. August 22. 2° 28'. 5 S. , 1 3 1° 3'-3 E. 118 m. Bottom: hard coarse sand. 1 young 



specimen. 



These specimens agree perfectly well with the accurate description and figures of Berthold. 

 The principal characters of Scyll. Haanii are the following. The carapace carries in the middle 

 line two small teeth. The anterior tooth on the anterior margin is in a line with the inter- 

 spaces between the teeth at the inner orbital angles; the acute tip of the somewhat larger, 

 second tooth is situated in a line with the posterior margins of the orbits. A doublé row of 

 squamiform tubercles, situated close near one another, occurs in the middle line of the cardiac 

 region, the foremost pair, overhanging the cervical groove, are a little more prominent, almost 

 dentiform ; on either side of this row one observes a group of squamiform tubercles on the 



