No. 10 garth: brachyuran fauna of the galapagos 377 



166-34. Black Beach, Charles Island, shore, Jan. 19, 1934, 1 small 



male. 

 169-34. Academy Bay, Indefatigable Island, 15-25 fms, Jan. 20, 1934, 

 1 young. 

 Measurements. — Largest male: length 21.3 mm, width 14.0 mm, 

 cheliped 22.0 mm, chela 11.1 mm, first ambulatory leg 26.0 mm. 

 Habitat. — Seaweeds. 



Remarks. — This species, which has been known to occur in the 

 Galapagos Islands since earliest times, is generally secured from marine 

 plant washings. 



A large series of tiny individuals was obtained, probably from algal 

 washings, at a shore station at Cormorant Point, Charles Island. The 

 series consisted of 5 male and 7 female specimens, of which 3 were oviger- 

 ous, and 7 young. It was possible to distinguish the sex quite readily on 

 specimens 3 mm or more in length,and a 7.5 mm female was found carry- 

 ing eggs. This is but one-third the length of the male the measurements 

 of which are given above. 



Genus EUPLEURODON Stimpson, 1871 

 Eupleurodon rathbunae Garth 



Epialtus peruvianas Finnegan, Journ. Linn. Soc. London, vol. 37, p. 620, 



1931. 

 Eupleurodon rathbunae Garth, Allan Hancock Pac. Exped., vol. 5, no. 

 2, p. 13, pi. 3, figs. 1-5, 1939. 



Type locality. — Gardner Bay, Hood Island, Galapagos Islands. 



Type.— USNM No. 77366. 



Range. — Known only from the type locality. 



Diagnosis. — Carapace foreshortened, wider between anterolateral 

 than between posterolateral lobes. No preocular tooth. No small tooth on 

 lateral margin between the two lobes. Distance between anterior lobes 

 greater than distance from the tip of anterior lobe to middle of posterior 

 border. 



Material examined. — 

 27-33. Gardner Bay, Hood Island, shore, Jan. 25, 1933, female holo- 

 type (USNM No. 77366). 



Measurements. — Female holotype : length of carapace including ros- 

 trum 7.1 mm, width 5.3 mm, length of rostrum 2.1 mm. 



Habitat. — Among algae. 



Remarks. — Although the writer has not seen the Crossland specimen 

 referred to Epialtus peruvianus Rathbun by Finnegan (1931), a camera 

 lucida drawing made by Dr. Isabella Gordon of the British Museum 



