330 REPORT 1868. 



to stones, but more commonly growing parasitic on other sponges, es- 

 pecially on PkaJcellia ventjldbrum. 



Tetfiea lyneurium (Linn.). " Shetland, 1864" (Bowerbank in litt.). 



spinularis, Bow. The type specimens found on stones from 70-80 



fathoms, Out Skerries Haaf. 



Halwnemia patera, Bow. A very rare and remarkably interesting little 

 sponge, found 1863 and 1864. 



Diotyocylindrus virgultosus, Bow. The type specimen found in 1861 in deep 

 water off Out Skerries. 



stuposus (Ellis & Sol.). Yery fine specimens found in 1867. 



hispidus (Montagu). Dredged to the east of the Island of Balta, 1867. 



rugosus, Bow. A fine species, very local, but, where found, abundant. 



Out Skerries, Outer Haaf, 70-90 fathoms, 40 miles E.S.E. of Whalsey 

 Lighthouse. 



PhaTcellia robusta, Bow. In 100-170 fathoms, 20-25 miles N.N.W. of Burra- 

 firth Lighthouse. My finest specimen measures 5| inches long and 6 

 in diameter, and is fan-shaped, but doubled back upon itself so as almost 

 to form a cup. It is one of our finest species. 



ventilabrum (Linn.). Very common in deep water in 50-170 fathoms, 



though rarely at the former depth. Unquestionably the grandest Bri- 

 tish sponge. There are two magnificent specimens in my collection. 

 One, which spreads out at once from the base, so that the cup is hardly 

 developed at all, and the sponge is nearly flat, measuring 13 inches long 

 and 9 wide, but is only 3 inches high. The other takes the shape of a 

 very deep well-formed cup, composed of many lobes, cut almost to the 

 base of the sponge, but together forming a regular circle ; this sponge 

 is 10 inches high and as much in diameter at the summit. Proliferous 

 specimens often occur in which many small sponges grow from the inner 

 face of the parent. 



Microciona luevis, Bow. " Shetland, Mr. Barlee " (Bowerbank). The only 

 known specimen. 



armata, Bow. " Shetland, 1864 " (Bowerbank in litt.). 



spinulenta, Bow. " Shetland, 1864 " (Bowerbank in litt.). 



ambigua, Bow. Pound in 1861. 



atrosanguinea. " Shetland, 1864 " (Bowerbank in litt.). 



" simplicissima, Bowerbank, n. sp. Sponge coating, surface irregular. 



Oscula simple, dispersed. Pores inconspicuous. Dermal membrane pel- 

 lucid, spiculous ; spicula cylindrical, long, slender, and very flexuous ; 

 rarely acerate, irregularly dispersed, numerous. Basal membrane stout, 

 abundantly spiculous ; spicula like those of the dermal membrane, very 

 numerous and closely matted together. Skeleton columns short and 

 stout ; spicula acute, not more than half the length of those of the dermal 

 and basal membranes, but rather stouter. Colour milk-white in the 

 dried state. Habitat. Shetland, 96 fathoms (Rev. A. M. Norman). 

 Examined in the dried state." (Bowerbank MS.) 



Hymerapliia vermiculata, Bow. On stones, Shetland, deep water, not un- 

 common. 



clavata, Bow. On stones, deep water (Mr. Barlee and A. M. N.). 



stellifera, Bow. Outer Haaf, on stones, 1861 ; on shell off Balta, 40-50 



fathoms, 1863. 



" coronula, Bowerbank, n. sp. Sponge coating, thin. Surface un- 

 even; both strongly and minutely hispid. Oscula simple, dispersed. 

 Pores inconspicuous. Dermal membrane spiculous; tension-spicula 



