127 



8. Lima {Acesta) celebensis Bartsch. (Plate IV, figs. i^ — 6). 



1911. Lima [Fé-i^éT/ Pelseneer, "Siboga" Lamellibranches (Anat.), pp. 33 — 35 (nomen nudum). 

 191 3. Lima [Acesta) celebensis Bartsch, Proc. U. S. Nat. Mus. XLV, p. 240, pis. XVIII, XIX. 

 1919. Lima [Acesta] celebensis Thiele, Martini-Chemn. Conch.-Cab. (N. F.), VII [2a), Limidae, 

 p. 25, pi. VIII, fig. 4. 



A number of spécimens of varying sizes from the localities noted below and labelled 

 L. weberi in the "Siboga" collection full}- agrée with Bartsch's description of L. {A.) celebensis. 

 The name L. weberi has to be regarded only as a nomen nudum, as the species was never 

 described under this name. 



Measurements (in millimètres). 



Length 14.5 25.5 44.2 iio 



Height 17.8 31.6 55 156 



Diameter 3.2 5.6 10 52 



The first three measurements are of single valves only. 



Distribution : — Bartsch's spécimens of L. {A.) celebensis were dredged from a depth 

 of 950 mètres in Buton Strait to the south east of Celebes. 



The "Siboga" spécimens were collected at St. 45 (7° 24' S., i 18° 15^2 E. ; depth 794 mètres), 

 St. 259 (5° 29^.2 S., i32°52'.5E.; depth 487 mètres); St. 314 (7°36'S., ii7°3o'.8E. ; depth 

 694 mètres) and St. 316 (7° 19'. 4 S., ii6°49^5E. ; depth 538 mètres). 



9. Lima {Acesta) rathbuni Bartsch. 



1911. Lima crocea Pelseneer, "Siboga" Lamellibranches (Anat.), pp. 33, 34 (nomen nudum). 

 191 3. Lima [Callolimà] Rathbuni Bartsch, Proc. U. S. Nat. Mus. XLV, p. 237, pis. XVI, XVII. 

 1918. Lima [Acesta) rathbuni Thiele in Martini-Chemn. Conch.-Cab. (N. F.), VII [2 a), Limidae, 

 p. 23, pi. VI, fig. I, pi. VIII, fig. I. 



In the Anatomical part of the Report on the "Siboga" Lamellibranchia by Pelseneer this 

 species was referred under the name Lima crocea.^ butin view of Bartsch's description of the species 

 under the name Lima [Callolimd) rathbuni this name has now to be regarded as a nomen 

 nudum. Bartsch's elaborate description of the species fully agrées with the single adult shell 

 collected by the "Siboga" Expédition. A young shell, which was dredged not far off from the 

 adult shell referred to above, also appears to belong to this species. 



The young shell is almost transparent, but shows the beginning of the déposition of the 

 characteristic yellow pigment in the shell. The irregular radial ridges are also better marked 

 on the small shell. 



Measurements (in millimètres). 



Length 119 16.5 



Height 156 20.8 



Diameter 51 7.9 



Distribution : — The types of the species were obtained near the Phillippine Islands at 

 depths of 300 — 400 mètres (6° — i3°N., 120° — i24°E.). The "Siboga" spécimens were dredged 

 at St. 254(5°4o'S., i32°26'E. ; 310 mètres) and St. 256 (5° 26^6 S., 132° 32^.5 E. ; 397 mètres) 

 near the Kei Islands group. 



