182 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



with a small tuft of hairs distally, and a single posterior movable spinule 

 at articulation with dactylus; dactylus with short tufts of hairs, and three 

 very small spinules on posterior margin. 



Material examined: See Table 55. 



Measurements: Males, 3.5 to 19.0 mm; non-ovigerous females, 4.2 

 to 15.0 mm; ovigerous females, 5.0 to 14.4 mm. The 19.0 mm male and 

 15.0 mm female were collected by the Lund University Chile Expedi- 

 tion. Lenz (1902) also recorded a measurement of 19 mm for a spec- 

 imen with sex not stated. The types were reported to be 14 or 15 

 mm in length. 



Color: In alcohol, ground color dirty yellow, with broad, irregular, 

 ribbon-like stripes and spots of a red-brown color. (Lenz) Uniform 

 yellowish-red; walking legs banded with darker red. (Kinahan) 



Ecology : Common in the littoral, under stones. E. R. Guiler collected 

 specimens on tunicates (Pyura sp.) and from algae, Ulva and Les- 

 sonia. Specimens were taken by the Lund University Chile Expedi- 

 tion from holdfasts of a brown alga. The species has been dredged on 

 a few occasions to depths of 10 fathoms. 



Ovigerous females have been collected in every month of the year 

 except March, April, September, and December. 



Remarks: Guerin (1838b) gave the locality as "Coquimbo and 

 many other points in Chile." The Academy of Natural Sciences of Phila- 

 delphia has two dry specimens from the Guerin collection, taken at 

 Valparaiso and questionably labelled as types. 



Specimens identified by Dana (1852) as Porcellana punctata 

 Guerin were seen by Ortmann in the Academy of Natural Sciences of 

 Philadelphia, and redetermined by him (1897) as Petrolisthes angu- 

 losus. The present writer examined these same specimens, as well as 

 five in the Museum of Comparative Zoology also taken by the U. S. 

 Exploring Expedition and identified as Porcellana punctata by Dana. 



Range: Paita, Peru, south to Calbuco, Chile. Shore to 10 fathoms. 



Allopetrolisthes punctatus (Guerin), new combination 

 Plate 35, fig. 2; text-fig. 6(2) 



Porcellana punctata Guerin, 1835, pi. 18, fig. 1 (Icon. Regn. Anim. 

 Cuvier, 1829-44; pi. 18 published in 1835); 1835, p. 115 (type 

 locality, Chile) ; 1838b, p. 7 (type locality restricted to Valpa- 

 raiso) ; 1839, p. 175. H. Milne Edwards, 1837, p. 255. Cano, 1889, 

 pp. 96, 99, 261. Not Dana, 1852, p. 421. 



