. Bulletin. Science; Natural history; Natural history. 86 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 1. Plesionika mania semilaevis. Female, total length mm. miles, 43'/2° true from Ship Rock, Santa Catalina Island, California. 846-864 m. 24 February 1961. R. V. Vetera IV station 7299-61. 28 March 1939, Velero III station 948-39, numerous specimens, many of them ovigerous. Off La Plata Island, Ecuador: 83-102 m, rock and mud bottom, 10 February 1934, Velero III station 212-34, two specimens, one of them ovigerous. Remarks.—Despite extensive collecting by the Velero III and Vel
. Bulletin. Science; Natural history; Natural history. 86 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 1. Plesionika mania semilaevis. Female, total length mm. miles, 43'/2° true from Ship Rock, Santa Catalina Island, California. 846-864 m. 24 February 1961. R. V. Vetera IV station 7299-61. 28 March 1939, Velero III station 948-39, numerous specimens, many of them ovigerous. Off La Plata Island, Ecuador: 83-102 m, rock and mud bottom, 10 February 1934, Velero III station 212-34, two specimens, one of them ovigerous. Remarks.—Despite extensive collecting by the Velero III and Velero IV, other ships and collectors, no specimens of/*, mexicana have been reported from California since 1940. These animals may have strayed into northern waters dur- ing a particularly warm year but were unable to maintain a population in the area. Key to the Eastern Pacific Species of Plesionika 1. Second pereiopods markedly unequal in length P. mexicana. Second pereiopods equal or subequal in length 2 2. Rostrum moderately upcurved, with 2-8 dorsal spines P. martia semilaevis. Rostrum straight or strongly upcurved, with 11 or more dorsal spines 3 3. Carpus of second pereiopod with 8 segments, rostrum nearly straight P. beebei. Carpus of second pereiopod with 14-17 segments, rostrum strongly upcurved P. trispinus (Pacific coast of Colombia, Squires and Barragan, 1976). Acknowledgments I thank Fenner A. Chace. Jr., National Museum of Natural History, for the loan of specimens of P. trispinus. The specimens off. martia semilaevis in the collections of the Allan Hancock Foundation were sorted by John Yaldwyn and Manuel Murillo. The drawing was done by Ginny 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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