. Allan Hancock Pacific expeditions. Scientific expeditions. NO. 2 ROST : THE FAMILY ARCIDAE 209 one single broken valve mm in length, from Realejo, Nicaragua. Three samples of small specimens from Baja California and the Gulf of California are here referred to L. vespertine (Morch), as his description fits them very closelj^ One sample from Panama and two from the Galapagos Islands are referred to Lunarca sp. It is quite possible that all Lunarca from the west coast is one vari- able species similar to Lunarca ovalis from the east coast. A large amount of material from many localities is
. Allan Hancock Pacific expeditions. Scientific expeditions. NO. 2 ROST : THE FAMILY ARCIDAE 209 one single broken valve mm in length, from Realejo, Nicaragua. Three samples of small specimens from Baja California and the Gulf of California are here referred to L. vespertine (Morch), as his description fits them very closelj^ One sample from Panama and two from the Galapagos Islands are referred to Lunarca sp. It is quite possible that all Lunarca from the west coast is one vari- able species similar to Lunarca ovalis from the east coast. A large amount of material from many localities is needed before further con- clusions can be drawn. Lunarca vespertina (Morch) 1861 PI. 15, figs. 24 a-b; text-figs. 93 a-c Area (Argina) vespertina Morch, Malakozool. Blatter, vol. 7, 1861, p. 204. Fig.: Hertlein and Strong, 1943, PI. 1, figs. 6-7. Type loc: Realejo, Nicaragua. Holotype: ? Remarks: The west American species belonging to this genus are dis- cussed in the previous section under the genus Lunarca. Four specimens are here referred to Lunarca vespertina. They are all small and fit Morch's description very closely. The only figure of this species in existence is given by Hertlein and Strong (1943, PI. 1, figs. 6-7) and the rather large specimen figured, mm in length, does not strongly resemble the shells referred to the same species in the material at hand. The authors state, however, that larger specimens become more elongate, while the younger ones are more quadrate in y Wv- c r Fig. 93. Lunarca vespertina (Morch) 1861. Off Punta Pequefia, Baja California, a. Lateral view. b. Dorsal view. c. Ab- dominal sense organs. Length, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Allan Hancock Foundation. Los Angeles : Allan Hancock Foundation for Scientific Research, University o
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