A REVIEW OF THE MTSIDACEA 215 



specimens I have examined these structures are present, and I have 

 little doubt that Ii's specimens belong to the same species as those 

 described by Dershavin as Orientomysis dybowskii. My specimens are 

 in the closest agreement with Ii's description. The modification of 

 the fifth pleopod of the male is not found in any other species of the 

 genus and it escaped Ii's notice, though his largest specimens were as 

 big as mine. The female appears to be completely adult at 19 mm. 

 but it was only in the largest males, 25 mm., that I observed the fully 

 modified condition of the fifth pleopod. In a large female I counted 

 24 embryos in the brood pouch. The striking disproportion of the 

 sexes in the two large hauls of this species is interesting. 



ACANTHOMYSIS MACROPSIS (Tattersall) 

 FlGUEE 90 



Neomysis macropsis Tattebsall, 1932b, p. 330, figs. 59-65 ; 1933, p. 14. 



Occurrence. — California : During the survey of San Francisco Bay, 

 1912-13, the Albatross collected at stations H4988, 2 specimens ; H4990, 

 500+ specimens; H4995, 20+ specimens; H4996, 30+ specimens; 

 H4997, 200+ specimens; H5000, 25+ specimens; H5003, 50+ speci- 

 mens; H5005, 250+ specimens; H5008, 60+ specimens; H5011, 300+ 

 specimens; H5012, 200+ specimens; H5082, 200+ specimens; H5098, 

 500+ specimens; H5100, 6 specimens; H5106, 50+ specimens; H5123, 

 12 speciments ; H5125 specimens ? ; H5126, 30+ specimens ; H5127, 50+ 

 specimens; H5128, 50+ specimens; H5133 specimens?; H5140, 25 + 

 specimens; H5141, 1 specimen; H5147, 60+ specimens; H5149, 35 + 

 specimens; H5151, 10+ specimens; H5152, 20+ specimens; H5154, 

 75+ specimens; H5177, 25+ specimens; H5186, 150+ specimens; 

 H5196, 150+ specimens; H5 198, 75+ specimens; H5211, 10 specimens; 

 H5219 10+ specimens; H5228, 4 specimens; H5232, 25+ specimens; 

 H5244, 200 + specimens ; H5245, 35 + specimens ; H5246, 10 specimens ; 

 H5247, 9 specimens; H5248, 15+ specimens; H5249, 10+ specimens; 

 H5257, 100+ specimens; H5261, 200+ specimens ; H5267, 500+ speci- 

 mens; H5273, 500 + specimens ; H5282 specimens? ; H5286, 250 + speci- 

 mens ; H5287, 300+ specimens; H5300, 25+ specimens; H5302, 100 + 

 specimens; H5310, 250+ specimens; H5316, 500+ specimens; H5319, 

 300+ specimens; H5321, 75+ specimens; H5322, 100+ specimens; 

 H5323, 60+ specimens; H5324, 15+ specimens; H5325, 60+ speci- 

 mens; H5326, 50+ specimens; H5337, 15+ specimens; H5338, 8 speci- 

 mens; H5343, 1 specimen; D5712, 1 specimen; D5735, 3 specimens; 

 Sausalito, Zy 2 feet, March 2, 1912, 4 specimens ; Ked Rock, 4 feet, March 

 22, 1912, 150+ specimens. 



Distribution. — Known from California and the shores of British 

 Columbia. 



893476—51 15 



