132 Bulletin, Yanderhilt Marine Museum, Vol. Ill 



the posterior one; the latter is also produced on the anterior margin 

 to a broad triangulation but not emarginate posteriorly. Between the 

 fifth legs there is a flattish narrow plate, with the anterior margin 

 rounded, the posterior margin also rounded but with a narrow emar- 

 gination in the median linej this plate is one and two-fifths times as 

 long as broad. 



The adult male petasma likewise corresponds to that of the type 

 described and figured by Dr. de Man from the Indo-Pacific. 



The petasma, viewed from the anterior side, consists of two laminae 

 which meet along the median line for the proximal half of their length, 

 then are produced into a rounded, denticled process, which is directed 

 inward and in contact with its companion of the other plate ; beyond 

 this the median lines are also denticled, diverge, and the distal mar- 

 gin of this area terminates in a rather bluntly rounded small lobe, 

 which is less than half the length of the larger overshadowing lobe. 

 This larger lobe is rather broadly rounded, slightly concave on the an- 

 terior lateral face and correspondingly rounded on the posterior lat- 

 eral face ; there is a small tooth-like lobule adjacent to the large lobe 

 on the outer side near its base ; there is a large pointed tooth outside 

 the lobe but not quite so long ; this tooth is very acuminate, with the 

 tip curved forward and outward; outside of this there is a second 

 larger tooth with the lateral margins rounded, the tip briefly acumin- 

 ate and forward-directed; on the anterior side of the inner lateral 

 margin of this tooth there is a small tooth-like lobule; beyond the 

 tooth and below it there is on the posterior face a rounded, semi-fused 

 lobe which lays upon the proximal part of the outer teeth and is vis- 

 ible through it. There is also a long narrow, V-like process on the 

 anterior face of each half of the petasma near the middle of the inner 

 lateral margin and with the apex of the process directed inward. 

 Synonymy. — Gennadas clavicarpus de Man, "Sidoga'' Exped. Mon., 

 39a, pt. I, family Penaeidae, p. 19, 1911 (text), pis. 1 and 2, figs. 

 3-3k, 1913 (plates) ; Hid., Mon., 39a4, part 5, p. 3, pi. 1, fig. 1, 

 1922. 



Family: HOPLOPHORIDAE. 



Genus: ACANTHEPHYRA A. Milne Edwards. 

 Acanthepyra purpurea A. Milne Edwards. 

 Color plate in Mr. Vanderbilt's "To The Galapagos on the *Ara\" 

 Type: Milne Edwards' type was collected by "Travailleur" in 

 the Antilles, at a great depth, and is deposited in the Paris Museum. 



