25 



Stat. 12. March 14. 7°I5'S., U5°I5'.6E. 2S9 m. Bottom mud and broken shclls. 1 egg-ladcn, 



adult female. 

 Stat. 38. April 1. 7°35'.4S., H7°28'.6E. 521 m. Bottom coral. 1 young specimen. 



It is on the authority of Messr. S. Kemp and R. B. Seymour Sewell (1. c), that Pent. 

 Hextii Alcock is identified with Pol. typhlops Heller, so that this species appears as widely 

 distributed as Stereom. sculpta (S. I. Smith). 



The adult female from the western Bali Sea is a little larger than Alcock's types of 

 Pentacheles Hextii and closely agrees with the quoted description and figures. Measured in the 

 middle line and the abdomen being stretched out, this specimen proves to be 113 mm. long 

 from the tip of the single rostral spine to the extremity of the telson, the carapace being 

 49 mm. long, the abdomen 64 mm.; the difference in length (15 mm.) is but little smaller 

 than the length of the telson (19 mm.). The carapace shows its greatest width of 34 mm. at 

 the anterior extremity of the posterior division of the lateral borders, i. e. at the posterior 

 groove, for it is here a little wider than tvvo-thirds its length, measured in the middle line, 

 but less than two-thirds its greatest length (56 mm.), when measured from the antero- to the 

 postero-lateral angles. The distance between the acute spines at the antero-lateral angles that are 

 turned upward and slightly curved inward, measures 23 mm., i. e. tvvo-thirds the greatest width. 



The obtuse conical tooth that arises from the frontal wall of the carapace, immediately 

 beneath the single rostral spine, is directed obliquely fonvard and reaches almost to the level 

 of the upper surface of the carapace. The lateral border is armed at the left side with 

 7 -f- 5 + 24 spines, at the right side with 8 + 5 + 2 §: those of the posterior part diminish 

 gradually in size backwards and are mostly worn off. The sublateral ridges on the branchial 

 regions are described by Alcock as "quite straight and parallel with the lateral margins": in 

 the female from the Bali Sea both ridges first slightly converge backwards until their posterior 

 third and then again curve towards the lateral margin, these ridges are formed each by 17 

 or 1 8 spines. 



The spines at the frontal end of the ophthahnic peduncles are slender, acute. 



The narrow antennal scale reaches barely to the end of the peduncle; the antepenultimate 

 joint of the peduncle is armed with a sharp tooth at the far end of its inner border and a sharp 

 spine occurs also at the distal end of the inner border of the penultimate and of the terminal joint. 



The antennular scale, the upper border of which is serrate, reaches barely farther 

 forward than that of the outer antennae; the basal joint carries a small spinule at the outer 

 angle near the acoustic sulcus and a slightly longer one behind it. The legs of the i 5t pair 

 are about 1 20 mm. long, a little longer than the body. They agree with the original description : 

 there are two spines, behind one another, at the far end of the upper border of the merus, 

 like on the right leg of Fig. 2a of the "Illustrations". The merus is 35 mm. long, measured 

 at its lower border, the chela 38,5 mm. 



The numerous eggs are globular, diameter 0,56 — 0,6 mm. 



The young individual is 39 mm. long, the carapace, measured in the middle line, 17 mm., 

 the abdomen 22 mm., the difference, 5 mm., being two-thirds the length (7,5 mm.) of the telson. 

 The formula of spines for the left border of the carapace is s, for the right e. 



SIBOGA-EXPEDITIE XXXIXa 2 . ± 



