THE FOSSIL STALK-EYED CRUSTACEA §7 



lateral tubercle on the intestinal region. The second abdominal sece- 

 rnent is raised in a tubercle. "^ 

 The left cheliped reaches beyond the carapace as far as the lenc^th 

 of the carapace (pi. 21, fig. 1), the right appears smaller; thev are 

 both stout, with carpus and manus elongate, larger manus increasino- 

 a little in height distally (pi. 21, fig. 2) ; a cross-section near the 

 proximal end is subcircular, height 11.5 mm., thickness 9.3 mm.; 

 ^ its outer, upper and under surfaces are covered with tubercles or 

 < coarse granules. Similar but larger tubercles are to be seen on the 

 right merus and carpus. The basal part of the immovable finger 

 IS at Its attachment less than half as high as palm, thick a^'nd 

 gradually tapering. The merus of an ambulatory leg is narrow 

 with a somewhat sinuous outline, surface wrinkled, upper margin 

 \ with a row of appressed spines. Of the ventral surface the only 

 j exposures are a small article, apparently the ischium of the chelipeds. 

 I Measure77ients.~Male holotype, median length of carapace 36 mm., 

 extreme length of carapace 41.5 mm., greatest width of same 39.4 mm.^ 

 , width at hepatic regions 31 mm., posterior width 27 mm., distance be- 

 : tween horns 5 mm., length of merus of an ambulatory leg, perhaps 

 of the penult pair 30 mm. 



Occur7'e?ice.~Ovegon: Judkins Ridge, near Eugene; Oligocene 

 series in sedimentary tufaceous sandstone; one specimen, male, holo- 

 type (Cat. No. 352912, U.S.N.M.). 



Belation,~This form differs from other Homolidae in its form, 

 which is more broadly ovate, the sides converging from the widest 

 part, the middle of the branchial regions, to a narrow front. In 

 other Homolids the carapace is of moderate width, oblong, chano-incr 

 little in width until near the anterior margin. In its strong horn^ 

 our species resembles Homolus {=Palaehmchus) longipes (Wood- 

 ward) ^^ fj,Qj^ ^j^g Jurassic. 



It is possible that the new form should be placed in the Latreil- 

 hidae. LatreiUopsis Henderson^^ approaches it in the prominence 

 of the hepatic region but is not rotund; has a median rostral spine, 

 which Palehomola is not known to have, as well as a supraocular 

 spine on either side; the strong, rough chelipeds of our species are 

 similar to those of L. petterdi Grant.^* 



Superfamily DROMIIDEA Ortmann 



Family DROMIIDAE Alcock 



Carapace subglobular, rarely flattened; no lineae anomuricm; 

 two obliquely longitudinal grooves on sternum of female. Eyes and 



»2 Quart. Journ. Geol. Soc. London, vol. 22, 1866, p. 494 pi '>4 fi.^ i 

 ^ ChaUenger Kept., vol. 27, 1888, p. 21. ' • «■ • 



« Proc. Linn. Soc. New South Walp.s, vol. 30, 1905, p. 317, pi. 10, figs. 2, 2a. 26. 



