512 OS CETJSTACEA LIVING IN THE VENUS S FLOWEE-BASKET. 



Hub. Philippine Islands. (Several specimens, adult and young, 

 witliin Meyerina claviformis, Grray, from Zebu.) 



If the position of the animals in the Sponge be natural and un- 

 disturbed, they would seem to have made their way to the hollow 

 interior by breaking through the tissues. Several specimens are 

 actually embedded in the substance of the Sponge. One which 

 I extracted is an adult female with ova ; another is quite young. 



On account of the non-dilatation of the basal joints of the an- 

 tennules, and the long inferior antennse, &c., this species appears 

 to be better placed in the genus Cirolana than in u:Ega. It is at 

 once distinguishable by the triangular terminal segment, the 

 spines on the under surface of the legs, and the form of the 

 rami of the sixth pair of postabdominal appendages. The speci- 

 men bearing White's MS, name is from Swan B-iver. Dana's 

 specimens are from Borneo ; and his figure agrees in every respect 

 with the specimens from the Philippines, except that the inner 

 ramus of the uropoda is represented as less distinctly triangular 

 and truncated at the extremity. The j^ga macronema of Bleeker 

 (Acta Soc. Sci. Indo-Neerl. ii, p. 23, pi. i. fig. 1, 1857), taken from 

 various species of fish inhabiting the seas of Batavia, has, like this 

 species, a triangular terminal segment, but differs in the form of 

 the uropoda, &c. 



In the British Museum are several specimens from the Philip- 

 pines, presented by S. T. Martin, Esq., " from the interior of 

 Meyerina^'' and others " from Sponges collected by Dr. Meyer." 

 In what appear to be the males, the median frontal lobe is greatly 

 produced, reflexed, and blunt at the extremity. In some speci- 

 mens the body is nearly or quite destitute of hair. 



DESOEIPTION OF PLATE XXIV. 



Fig. 1. Bpongicola venusta, De Haan. Lateral view of $, X twice nat. size. 



2. . Dorsal view of its cephalothorax. 



3. Mga spongio^hila, Semper. Lateral view of $ , nat. size. 



4. . Dorsal aspect of 5 , nat. size. 



5. . Front foreshortened view of head, antennules, and antennae, 



X twice nat. size. 



6, 7, 8. Cirolana multidigitata, Dana, shown in three diiferent positions 

 within the sponge-tissue of Meyerina claviformis, Gray ; drawn from 

 mounted specimen in British Museum. Fig. 6 is a sketch of a median 

 longitudinal section of the sponge, displaying {a) the animal in the cen- 

 tral excretory canal: os, oscular area; others close by are partially 

 covered by the spicular veil. In fig. 7 an animal (a) fills an oscular 

 space; and in fig. 9 an exterior view of same is shown, a dermal" lace- 

 work of spicules surroundmg. All nat size. 



0. Head of male C. muUidigitata, X twice nat. size. 



10. Ditto of female C. multidigitata, X twice nat. size. 



1 1 . Uj^er view of terminal segment and uropoda of same species, nat. size. 



