422 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



tulipes A. Milne Edwards, gives only comparative differences between 

 the two species. Now that the true analogue from the Bay of Panama is 

 known, Rathbun's species takes its rightful place as a Gulf of California- 

 northwest Mexico endemic species, and as such is deserving of inde- 

 pendent description. It is the Panamanian species which needs point by 

 point comparison with its Atlantic counterpart. 



Hemus finneganae, new species 

 Plate X, Figs. 1-6; Plate Y, Fig. 7; Plate 47, Fig. 2 



Hemus analogus Finnegan, 1931, p. 623. Not H. analogus Rathbun. 



Type: Male holotype, Cat. No. 100918, U. S. National Museum, 

 from off South Viradores Islands, Puerto Culebra, Costa Rica, 10 fath- 

 oms, February 25, 1934, Velero III station 257-34; ovigerous female, 

 allotype, same locality, 3-10 fathoms, February 24, 1934, Velero III 

 station 254-34. See also Material Examined below. 



Measurements: Male holotype: length 6.7 mm, postorbital width 

 3.3 mm, branchial width 6.0 mm, frontal length 0.7 mm, frontal width 

 1.1 mm, length of first meral shield 2.6 mm, width 1.6 mm. Female 

 specimen (not allotype) : length 9.4 mm, width 8.9 mm. 



Diagnosis: Front broad, sides straight, tips well separated. Orbits 

 low, deeply indented, a preorbital granule or granules. Cardiac region 

 high, but not encroaching on adjacent areas ; three distinct lateral teeth. 

 Meral shields broad, concave, margin strongly denticulate. Second mov- 

 able antennal segment large, transverse. Male first pleopod with a 

 double lateral flange. 



Description: Carapace distended, cardiac and gastric regions promi- 

 nent, widest at postbranchial level, constricted at hepatic level, micro- 

 scopically punctate, and roughly granulate. Rostrum broad, little de- 

 flexed, truncate-triangulate, its straight sides culminating in a pair of 

 well-separated bead granules, a shallow sulcus inside each margin and 

 a row of minute granules on either side of a slight median groove. Orbits 

 deeply indented, a closed fissure on superior border, margins granulate, 

 two larger granules at the obtuse anterior angle in place of a preorbital 

 tooth or spine. First movable article of antenna almost as broad as long, 

 flaring posteriorly, and outwardly fringed with hairs. Second movable 

 article inserting at anterointernal angle of, and bent at right angles to, 

 first, the cylindrical, multiarticulate flagellum appearing to arise from 

 its lateral, rather than its anterior, margin. Gastric and cardiac regions 

 elevated, joined by an hourglass constriction, opposite on either side a 

 reniform depression containing anteriorly a hair-tipped papilla and pos- 



