REPORT ON THE CRUSTACEA MACRURA. 93 



but, remarkable as it may seem, this is not the case. Had these West Indian specimens 

 been taken in the eastern seas, we should have been prepared to consider them as being 

 of some known species obtained there, from their resemblance in all important features. 



The central e)*e has become relatively small and appears to be connected with the 

 carapace, or perhaps more correctly speaking is situated behind the somite that carries the 

 ophthalmopoda. The ophthalmopoda, slightly decreasing in their comparative length, 

 are still two-jointed, and are now distinctly attached to a somite that is separated from 

 the carapace. The first pah' of antennae has the two fiagella in an embryonic condition 

 varying little from that seen in the last preceding description. The second pair of 

 antenna? has four distinct joints, the three basal are subequal, the fourth is longer than 

 the three preceding, slightly tapering, and commencing at its base to be divided into 

 annuli. Upon the met opal surface of the carapace an ovate foramen exists, the connection 

 of which with the green gland is apparent, and at its side is a second glandular body, 

 smaller and of different structure. Near this, on the wall of the carapace, may be seen 

 the feathery extremity of the long and slender calcified tendon that raises and closes the 

 mandible, to which it is attached on the under side near the upper extremity of the 

 apophysis. The metastoma exists as two circular foliaceous plates, behind which may be 

 seen the two foliaceous branches of the first oral appendages, which as yet are immature. 

 The stomach is becoming visible above and posterior to the oral apparatus, behind which 

 it is mostly hidden. The distance of this from the next succeeding pair of appendages 

 is proportionally less than in the preceding specimens, but even now it is equal to half 

 the distance of the oral apparatus from the frontal margin of the carapace. The next in 

 succession is the small pair that in the preceding specimens corresponds to the anterior 

 angle of the pereion. It now consists of a basal joint, to which are attached a large and a 

 small foliaceous plate. The next succeeding pair of appendages still retains the unbranched 

 pediform character, but is furnished with a strong spine at the extremity of the propodos 

 besides a few less important hairs. This spine is as thick and as long as the dactylos 

 and gives the appendage a chelate appearance, which is probably a specific rather than 

 a developmental character. The three next succeeding pairs retain the same character 

 as in the younger and more early stages. The pleon has increased in length a little, and 

 all the pleopoda are present as pedunculate biramose appendages, agreeing in character 

 with the permanent form, but still immature; the cilia that fringe the margins being 

 yet undeveloped, and a small notch existing where the future stylamblys will be. The 

 posterior pair as yet merely repeats the form, but is larger and has a small prominence 

 on the outer ramus, where the future external tooth will be situated ; this is still 

 more prominent in the underlying dermal tissue that is apparent beneath the surface. 



The next largest specimen is from the same locality as the preceding, St. Thomas in 

 the West Indies, and is 35 mm. in length. The appendages have very nearly the 

 same relative proportion; the pleon is still short, being only 7 mm., or one-fifth of the 



