IOI 



Calman, Peripandalus de Man, Pandalopsis (A. M.-Edw.) Bate, Pantomus A. M.-Edw., Plesionika 

 Bate, Parapandalus Borr., Heterocarpus A. M.-Edw., Dorodotes Bate, Chlorotocella Balss and 

 Chlorotocus A. M.-Edw. The species of the genus Paudalus Leach, about 20 in number, though 

 some may prove to be synonyms, are found either north of the tropic of Cancer or south of 

 the tropic of Capricorn and have not vet been observed between the tropics. The majority of 

 the species of this genus are found in the North Atlantic and in the North Pacific, but do not 

 occur in the Mediterranean, while only four are known from the southern hemisphere. The genus 

 Dichelopandalus Caull., which is closely related, includes two species, one in the eastern, the 

 other in the western half of the North Atlantic, the latter, however, has also been observed 

 off Shumagin Bank, Alaska. The only species of Pandalina Calman ranges, in the northeast 

 Atlantic, from the Barents Sea to the Mediterranean. The genus Peripandalus de Man is also 

 represented only by one species, Perip. serratus (A. M.-Edw.) from Upolu, Samoa Islands. 

 The six or seven representatives of the genus Pandalopsis (A. M.-Edw.) Bate, that differs from 

 the other genera by the conspicuous laminar expansion at the inner border of the ischium of 

 the i st pair of legs, are all distributed throughout the North Pacific either on the east or on 

 the west side, except only Pandalopsis aiupla Bate, which was taken by the "Challenger" off 

 Monte Video, but afterwards proved to range also from Washington to Mexico on the west 

 coast of North America. Pantomus parvulus A. M.-Edw. is the only representative of a genus, 

 which is characterized, like the genus Rhynehoeinetes H. M.-Edw., by the rostrum being movably 

 articulated with the carapace : this rare Crustacean is still only known from off the south coast 

 of the Inited States. Except probably this remarkable genus Pantomus and except the genus 

 Peripandalus, the preceding genera do not occur between the tropics, the six remaining, however, 

 are all represented in the tropical seas. It appears superfluous to expatiate on the distribution 

 of these genera, that are all represented in this collection, because in the general introduction 

 to each genus the geographical range of their species will be fully elucidated. 



Yery interesting are the catches made by the "Siboga" in this family, not only on 

 account of the discovery of three new species and two new varieties, all remarkable, but also 

 on account of the great number of specimens of some species, so that our knowledge of this 

 family has considerably increased. As the result of the investigations chiefly of the "Challenger" 

 and of the "Siboga", we know at present that the Indian Archipelago is inhabited by 10 species 

 and 1 variety of Heterocarpus A. M.-Edw., by 10 (or probably 12) species and 2 varieties of 

 Plesionika Bate, by 2 or 3 species of Parapandalus Borr. and by one species of each of the 

 three genera Dorodotcs Bate, Chlorotocella Balss and Clilorotoeus A. M.-Edw. 



K e y to the genera of Pandalidae. 



a x Carpus of 2 ,ul pair of thoracic legs multiarticulate, the 

 number of articulations more than three. 

 b x Excepting a postrostral crest the carapace is smooth. 

 fj Rostrum immovable. 

 </j Eyes large, much wider than the eyestalk. 

 c x External maxillipeds with exopodite. 



