PART 1 GARTH : PACIFIC OXYRHYNCHA 213 



Steamer Albatross, through the courtesy of Dr. F. A. Chace, Jr., curator 

 of marine invertebrates, U. S. National Museum, with identification by 

 M. J. Rathbun. 



Measurements: Largest specimen, male: length 108 mm, branchial 

 width 93 mm, hepatic width 63 mm, rostrum 14.5 mm, basal width 12.7 

 mm, cheliped 188 mm, chela 91 mm, dactyl 52 mm, height of palm 35 

 mm, ambulatory legs 160, 125, 105, and 95 mm, respectively. Female, 

 ovigerous : length 87 mm, branchial width 72 mm, hepatic width 50 mm. 



Color: Yellow with red dots. (Targioni-Tozzetti) In life, brown. 

 (Lund University Chile Expedition) 



Habitat: In rocky crevices in deep water. (Bell) Invariably found 

 under stones in the rock pools at about half-tide. (Cunningham) Among 

 algae and encrusted with serpulids. The masking habit of the species is 

 discussed by Aurivillius (1889). 



Depth : Although there is no previous record of depth with any speci- 

 men, aside from the statement of Bell under Habitat above, Lund Uni- 

 versity Expedition specimens were taken on two occasions below the 

 intertidal zone, once in 8 and once in 40-55 meters. 



Size and sex: Lund University Expedition material contains young to 

 5.5 mm minimum size, making possible for the first time a comparison 

 of growth and development of this Southern Hemisphere species with the 

 corresponding Taliepus iiuttalli of the North Pacific. The smallest speci- 

 mens show a "prehepatic" (or postorbital) spine close to the eye, while 

 the real hepatic spine is first visible in 18 mm specimens. Sex is doubtfully 

 determinable in 9 and 10 mm specimens, but 11 mm specimens are readily 

 distinguishable as male or female. Small to medium sized young show 

 two gastric tufts that develop into the gastric tubercles of 33-34 mm 

 specimens. A female of this size (34 mm) is still "in velvet," while a 

 64.5 mm female is ovigerous. 



Breeding: The large ovigerous female from Montemar, near Val- 

 paraiso, cannot be assigned a definite date, as collections were made at 

 the Marine Station in September and October of 1948, and again in 

 June, 1949. A female from Canal Chacao, Chiloe, had already shed its 

 ova when captured in late February, 1949. Two females from SE of 

 Punta Ahui, Bahia de Ancud, were in berry when taken in May, 1949. 

 The February date for the ovigerous female from Port Otway [Puerto 

 Barroso], Magallanes Territory, should be noted. 



Remarks: As compared to Taliepus marginatus of like size and sex, 

 T. dentatus is much more rotund, its ambulatory legs relatively longer, 

 not shorter than in the allied species, as stated by Rathbun in the de- 



