228 Mr. H. J. Carter on Deep-sea 



An "Addendum " will be appended, in which a list of all 

 the sponges dredged up by the ' Porcupine ' during her cruises 

 in 1869 and 1870, with their respective localities generally, 

 will be given ; then a list of all the dried specimens without 

 numbers which have been handed over to me ; finally, a few 

 " Memoranda " on some minute organisms which accompanied 

 the sponges — to Avit, Polytrema, Xanthidium, and Coccoliths, 

 together with a note on the " black grains " often seen in great 

 abundance in the Globigeriniferous sand. 



Halisarca cruenta^ n. sp. 



General form film- like, spreading, with irregularly undu- 

 lating margin. Colour madder-brown, crimson, becoming 

 crimson-black on the surface when dry. Surface smooth, 

 corresponding with the irregularities of the object on which 

 it may be growing ; consisting of a delicate sarco-fibrous 

 layer. Pores and vents not recognized. Internal structure 

 madder-pink, composed of areolar sarcode in which are im- 

 bedded the ampuUaceous sacs and, when present, also ova, 

 which are known by their spherical form and deeper colour ; 

 traversed by the branched excretory canal-system. Ampul- 

 laceous sacs about 10-6000ths inch in diameter ; spongozoa 

 about |-6000th, and ova about 4-6000ths inch in diameter. 

 Size of specimens varying, under 2 inches in horizontal dia- 

 meter. 



Hoh. Marine, on the surface of Corallistes Boioerhankii^ 

 Johnston ; Stelletta pachastrelloidesj n. sp., and Pachastrella 

 abyssi^ Sdt., extending into and tinging with its red colour 

 for a certain distance the structure on which it may be 

 growing. 



Loc. Station 25 = 374 fathoms — that is (as the " station " 

 and " depth " are inserted together on the " Chart "), a few 

 miles north of Cape St. Vincent. 



Ohs. This sponge has very much the appearance of spots 

 of venous blood, especially when dry ; and the colour is deepest 

 where the specimen is charged with ova, from the dark crimson 

 colour of the latter. It looks very much like Hildenhrandtta 

 rvhra at first sight, on account of its thinness and dark blood- 

 red colour ; but the absence of the algal cell and the presence 

 of ova distinguish it from the cellular structure charged with 

 conceptacles bearing tetraspores and paraphyses in the latter. 

 As the specimens are not favourable for description, the above 

 observations must to a certain extent be taken provisionally. 

 It is at all times difficult to make out the minute structure of 

 Halisarca^ which can only be most advantageously examined 



