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of each horn a flattened, triangular lamina projects forward at an oblique angle with the level 

 of the horns ; as the tips of these plates are contiguous while their inner margins slightly 

 diverge proximally, they leave a triangular interspace between them. In a lateral view the 

 petasma appears somewhat convex just beneath the two triangular laminae, the proximal end of 

 the stem is truncate ; at the level of the posterior margin of the lateral horns, the margins of 

 the median fissure on the posterior surface of the petasma carry each a small tooth, that one 

 recognises the best when the petasma is looked at from above. 



The sterna of the three anterior somites bear a small tooth in the middle. 



The male from Stat. 258 is a little smaller, 37 mm. long, the carapace, rostrum included, 

 being 13,25 mm. long. The rostrum is armed with 9 teeth in addition to the epigastric tooth, 

 but for the rest resembles that of the other male. The petasma also resembles that of the other 

 specimen, but the flattened, triangular laminae that project from the anterior border are not in 

 contact with one another, but leave an interspace between them, their inner margins running parallel. 



This species is remarkable because the pereiopods of the i*^' and 2"'^ pair 

 carry no epipod, this appendage being only present on the legs of the 3''^ pair. 



Parapenaeopsis W.-Mas. 



The genus Parapenaeopsis comprises at present 10 or 11 species, that are all inhabitants 

 of the Indopacific, no species having been observed in the Atlantic or even on the west coast 

 of America. Parap. corimta (Kish.) is distributed from Bombay and Singapore to Japan; it is 

 one of the two species collected by the "Siboga", a female having been captured at the 

 anchorage off Djangkar (Java). Closely related to this species, perhaps identical, is Parap. 

 inaxillipedo Alcock, recorded from Bombay, Madras and the Arakan coast. Parap. scnlptilis 

 (Heller) occurs not onl)- on the west and on the east coast of India and in the Bay of Bengal 

 (Mergui), but has also been taken at Penang, off the coast of Java, on the west coast of Borneo 

 and at Hongkong; the variety Hardivickii Miers is with certainty known from the east coast 

 of India, while the variety cultrirosiris has been observed off the northern coast of the Bay of 

 Bengal. Parap. uncta Alcock, Parap. nana Alcock and Parap. acclivirostris Alcock are forms 

 occurring on the east coast of India, but the last species has also been taken in the Persian Gulf. 

 Parap. stylifcra (H. M.-Edw.) is known from the west coast of India and from Palk Strait, 

 while the variety corojuandelica Alcock occurs on the east coast. Parap. gracillima Xob. is 

 onl)- known from the coast of .Sarawak, Parap. Hungerfordi only from Hongkong, and Parap. 

 tenella (Sp. Bate), with which Parap. crticifera (Ortm.) is identical, occurs along the lower half 

 of Japan, in the Bay of Kobe and in the Inland Sea of that country. 



One new species was discovered by the "Siboga", Parap. vcnitsta, captured on the 

 east coast of the Aru Islands. Species of Parapenaeopsis have apparently not yet been observed 

 in the Red Sea, in the western Indian Ocean and in the Central and South Pacific. 



Of the majority of the species the bathymetrical distribution is unknown, but they seem 

 to be inhabitants of shallow water. Parap. cormita was captured by the "Siboga" at a depth 

 of 9 meter and the new Parap. veniista in water of 13 m., the Japanese Parap. tenella occurs 



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