46 



Panulirus penicillatus A. Gruvel, in: Annales de 1'Institut Océanogr., T. III, Fase. IV, Paris 



191 1, p. 31, PI. II, fig. 4. 

 Palmt/ rus Ehrenbergi C. Heller, in: Sitzungsber. Kais. Akad. Wiss. Wien, Bd. XLIV, 1861, 



p. 260, Taf. II, Fig. 8. 

 Palinurits Ehrenbergi C. K. Hoffmann, Crustacés et Echinodermes de Madagascar, 1874^.30, 



PI. VIII. 



West-Nias. 3 males and 1 young female, collected in 1910 by Mr. KLEIWEG DE ZWAAN. 

 Lasikin (Simalur), Sumatra. 1 male, collected April 1913 by Mr. E. JACOBSON. 

 Labuan Badjau (Simalur), Sumatra. 1 male of medium size, collected June 191 3 by Mr. E. 

 JACOBSON. 



The largest specimen, the male from Lasikin, measures 308 mm. from the frontal margin 

 to the end of the telson, the carapace being 104 mm. long, nearly half as long as the abdomen ; 

 the other male of Mr. Jacobson is 185 mm. long. The largest male from West-Nias is 225 mm. 

 long, the carapace measuring 85 mm.; the tvvo other males are nearly of equal size, their carapace 

 being 75 mm., respectively 72 mm. long; the female measures 138 mm., the carapace 48 mm. This 

 species, however, attains a length of 380 mm., the carapace being then 155 mm. long (Nobili). 



In the adult male from Lasikin and in the two largest males from West-Nias all the 

 tubercles and spines of the carapace are naked, but in the male from Labuan Badjau and in the 

 youngest male from West-Nias the stiff setae of a yellowish-brovvn colour are distinctly developed, 

 while in the young female they are still also partly present. In the older specimens these setae 

 are apparently worn off, the small impressed puncta, however, are still everywhere visible. 



In all the specimens the transverse furrows on the abdominal somites are continuous, 

 no one is interrupted. In the "Histoire Nat. des Crustacés" H. Milne-Edwards says, 

 however, concerning the abdomen, that it is "piqueté et conforme du reste comme celui de la 

 L. mouchetée", i. e. Panul. guttatus (Latr.), in which the furrow of the 4" 1 somite is sometimes 

 interrupted (Gruvel); in Panul. Ehrenbergi (Heller) the transverse furrows of the 4 th and of the 

 5 th somite are interrupted, but, like in Panul. guttatus, the specimen, on which Panul. Ehren- 

 bergi was established by Heller, may have presented a rare exception. In the medium-sized 

 male [from Labuan Badjau and in the youngest male and in the female from West-Nias the 

 furrows are setiferous, but in the 3 largest specimens the setae are here all worn off, though 

 they exist still on the posterior margin of the segments. 



The youngest male from West-Nias bears 2 or 3 teeth on the anterior margin of the 

 pleura of the 2 nd abdominal somite and one tooth on that of the 3 rd , 4 th and5 th , which teeth 

 gradually decrease in size, but the pleura of the 6 th and of the i st are entire, unarmed. In 

 the two largest examples from the same locality these teeth are partly worn off and the anterior 

 margin of the pleura of the 5 th somite appears entire, in one male even that of the 4 th . In 

 the female, finally, there are 2 teeth on the anterior margin of the 2 nd pleura and one on the 

 3 ld and 4 th , while the 5 th and the 6 th , like the i st , are unarmed. 



In the adult male from Simalur there are 2 teeth on the anterior margin of the pleura 

 of the 2 nd somite, but the posterior is rudimentary, 2 well-developed teeth on that of the pleura 

 of the 3 ld somite, a rudimentary tooth on that of the 4 th , while the anterior margin of the 

 5 th and the 6 th is quite unarmed; the male from Labuan Badjau bears 3 teeth, the posterior 



