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them A. morn /a, A. ititermedia and A. lithotryae. The first was collected between Borneo 

 and Lombok at a depth of 538 m., the second X. \V. from the Key Islands at 90 m. depth, 

 the third near South Luciijara Island at a depth of 894 m. attached to the valves of Lithotrya 

 nicobarica. The last species has, not unlike A. quadrata Auriv., horny, nearly quite hidden 

 scuta; A. mortila can be recognised at once by the very peculiar structure of the capitulum ; 

 and A. intermedia stands so far as the structure of the 5''^ and 6''^ cirrus is concerned between 

 the species with quite normal rami and those in which the inner ramus is quite rudimentary. 



Including the 5 species from the "Siboga" we now have 19 species of Alepas in all. 

 The absence of calcareous parts or valves which facilitate the separation of the species in other 

 o"enera (in Scalpellmn e. g.) makes this distinction a troublesome one in Alepas. The outward 

 shape of the capitulum, the length and proportions of the peduncle are liable to change with 

 the age, under the influence of the fluid used for the conservation etc. The question whether 

 all the species described are really good species in the case of Alepas is more difficult to answer 

 than for the other genera. Yet, considering the circumstances under which they were taken 

 (different objects or animals to which they were found attached, different depths, geographical 

 distribution) there can be no doubt, I think, but that most of the species are really different forms. 



The following table enumerates all the species at present known, arranged according to 

 their bathymetric occurrence with indication of their geographical distribution. The species found 

 in the Malay Archipelago are marked with an asterisk. 



Alepas Lankesteri Gruvel. 1465 m. Mona Channel, West Indies. 



* Alepas ovalis n. sp. 984 m. W. irom the Key Islands. 

 Alepas pedunculata Hoek. 740 m. Oft" New South Wales. 



* Alepas morula n. sp. 5 38 m. Between Borneo and Lombok. 



Alepas minuta Philippi. 355 — 250 — 100 m. Mediterranean, Atlantic Ocean. 

 Alepas xenophorae Annandale. 333 m. S. W. Coast of (English) India. 



* Alepas gigas Annandale. 290 m. Bali Straits. 

 *Alepas tennis n. sp. 204 m. South of Ceram. 



^Alepas ifttermedia n. sp. 90 m. N.W. from Key Islands. 



Alepas japonica Aurivillius. 80 m. Japan Sea, Hirado Street. 



*Alepas malaysiana Annandale. 55 m. Caspar Straits. 



*Alepas lithotryae n. sp. Reef. Near South Lucipara Island. 



Alepas tiibulosa Quoy & Gaimard. On Palinurus (Coast?). New Zealand. 



* Alepas quadrata Aurivillius. On Palinurus (Coast?). Thousand Islands (Java). 

 Alepas cornuta Darwin. ? West Indies: St. Vincent. 



Alepas parasita Sander Rang. Surface (on Medusae). Mediterranean, Atlantic Ocean. 

 Alepas Belli Gruvel. ? Cuba. 



Alepas microstoma Gruvel. ? Madeira. 



* Alepas indica Gruvel. Surface (on floating wood). Singapore and Nicobars. 



Thus, we see that of the 19 species described in the literature 9 or about the half have 

 been observed in the Malay Archipelago; in this region, the genus maj- indeed be called prolific. 



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