70 Bulletin Vanderbilt Marine Museum, Vol. VI 



berant. The cervical groove is very deep ; the hepatic and urogastric 

 grooves are fainter but distinct. The entire surface of the carapace 

 is highly ornamented, with five pairs of regularly spaced longitu- 

 dinal series of small, forward-directed spines, which are also ap- 

 proximately opposite if viewed in transverse series ; three and the 

 median half of the row being precervical in position, while the 

 lateral half of the fourth row and five additional rows are post- 

 cervical. The interstices between the spines, which themselves 

 decrease in size toward the hinder margin, are regularly paved 

 with low flattish semicircular tubercles, each of which has the 

 anterior margin rounded and closely adjacent thereto are three 

 small divergent spinules or bristles. 



The precervical segment is squarish with a protruberant clus- 

 ter of four strong spines, the lower and slightly shorter pair being 

 placed submedian on the anterior margin, while the second pair 

 are immediately behind the first pair with their bases contiguous. 

 These four spines are in line transversely with the distal marginal 

 spines of the first peduncular joint of the antennae; the second 

 and third peduncular articles of the antennae are similarly multi- 

 spinose. 



The antennulae are typical of the genus. 



The epistome (text fig. 2A) is produced anteriorly to an acute 

 median tooth, separated on either side by a concave, finely bi- 

 denticled marginal space from the submedian pair of teeth which 

 are subequal in size to the large median tooth; beyond the sub- 

 median pair of teeth the margin recedes obliquely backward. 



References : Astacus penicillatus, Olivier, G. A., Encyl. Meth., t. 



VI, 1811, p. 343. 

 Palinuwis penicillatus, Edwards, H. M., Hist. Nat. Crust., t. II, 



1857, p. 299. 

 Palinurus gigas, Bosc, L. A. G., Hist, des Crust, et Insectes, t. II, 



1825, p. 93. 

 Palinurus ehrenbergi. Heller, C, Reise Osterreich. Fregatte 



"Novara," Th. II, Abh. Ill, 1865, p. 95. 

 Palinurus penicillatus, BouviER, E. L., Compt. Rend. Acad. Sci., t. 



CLVII, 1913, p. 603. 



Senex penicillatus, Ortmann, A., Zool. Jahrb. Syst., Bd. VI, 1891, 

 p. 28, 29. 



