[SCIENTIFIC RESULTS OF THE PHILIPPINE CRUISE OF THE FISHERIES STEAMER 

 "ALBATROSS," 1907-1910.— No. 26.] 



THE GIANT SPECIES OF THE MOLLUSCAN GENUS LIMA 

 OBTAINED IN PHILIPPINE AND ADJACENT WATERS. 



By Paul Bartsch, 



Assistant Curator, Division of Mollushs, Uyiited States National Museum. 



During the cruise of the United States Fisheries steamer Albatross 

 in Phihppine and adjacent waters a number of Giant Limas were 

 obtained. Here, as elsewhere, they occurred only in deep water, the 

 least depth at which they were found being 161 fathoms, the greatest 

 559, with an average of 313.6. They were by no means abundant 

 or universally distributed, for of the 369 dredgings made in more than 

 100 fathoms, only 18 yielded these mollusks, and 205 of these stations 

 were made in depths between the two extremes in which Giant Limas 

 were obtained. To these 205, eleven stations might be added, which 

 differ only a couple of fathoms in depth from the above. Some of 

 the new species here described are remarkable for their gi-eat size, 

 being of much greater dimensions than any Giant Lima heretofore 

 known. 



The three large species obtained in the Sulu Sea and its ramifica- 

 tions among the islands, differ from those heretofore known by having 

 a shallow, broad, and oval resihum, which follows the outer border 

 of the hinge for a much greater distance than in typical Acesta, 

 characterized by Lima excavata Fabricius, the type of Acesta, in 

 which we have the resilium assuming the form of a deep curved wedge. 

 The characters of the two groups are well shown in our figures of 

 L. ratlibuni and L. celebensis. These characters, taken in conjunction 

 with the much less strongly developed sculpture in the three large 

 Phihppine species, is deemed sufficient to merit at least a sectional 

 recognition for which I propose the name CaUolima, with Imia {CoH- 

 lolima) raihhuni as type. 



In the adjoining table I quote measurements and data of pre- 

 viously described species from the papers by Mr. E. A. Smith ^ and 

 Dr. W. H. Dall.2 To these are added similar data from the present 

 material to render the table complete. 



J Ann. Mag. Nat. Hist., ser. 7, vol. 4, 1899, p. 251. 

 2 The Nautilus, vol. 16, No. 2, June, 1902, pp. 15-17 



Proceedings U. S. National Museum, Vol. 45— No. 1978. 



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