MACRURA. SCHMITT. 385 



distinctly crcnulated, the crenulatious being the con- 

 tinuations of ridges on their opposed surfaces. The 

 concave median plate of the thelycuni ends anteriorly in 

 two more or less contiguous though laterally placed 

 knobs, with a median knob lying between and behind 

 these two in the notch formed by the incurving of 

 the anterior margins of the lateral plates toward the 

 median line. 



In the Macleay Museum co-type received through the 

 Australian Museum, the anterior median plate of the 

 thelycuni is but little more than a slightly concave sur- 

 face with raised edges, w r hich though approximating, do 

 not at all attain the prominence and thickening neces- 

 sary to quite warrant designating the anterior extremities 

 of these edges as "knobs." 



This specimen is about 190 mm. in length ; carapace 

 and rostrum together, 70 mm. over all. The 26 mm. 

 rostrum has six teeth above and three below. The sub- 

 hepatic ridge distinctly fails to reach the angle formed 

 below the hepatic spine by the meeting of the antennal 

 sulcus with the ridge which terminates anteriorly in 

 the antennal spine. 



From the specimens at hand it appears that, above, 

 the rostral teeth may vary from five to seven, and below, 

 from three to four. Of the specimens \vith complete 

 rostra, forty had 6 / 3 ; seven, T / 3 ; two, 6 / 4 5 one > ~ Iz i o ne ? 

 5 / 3 ; one specimen with an obviously regenerated rostrum 

 had but four teeth above and one below. The typical 

 count given by Haswell was six above and three or four 

 below. 



Size. The late Allan K. McCulloch wrote me that 

 this species "occasionally reaches a large size. Our 

 largest specimen measures 12-25 inches (about 310 mm.) 

 from tip of rostrum to end of telson, and comes from 

 Port Jackson," the same locality as that of the 190 mm. 

 co-type mentioned above. The length of the greater 

 number of specimens ranges between 150 and 206 mm. 

 Most of the specimens, how r ever, are about the size of 

 the co-type. 



PENEUS LATISULCATUS,, Kishinouye. 



Pencvns latisulcatus, Kishinouye, Jour. Fish. Bureau, 

 Tokyo, viii., 1900, p. 12, pi. ii., fig. 2, pi. vii., fig. 2. 

 Id. Rathbun, Proc. U.S. Nat. Mus., 1902, xxvi., p. 27. 



