830. REPORT—1868. 
to stones, but more commonly growing parasitic on other sponges, es- 
pecially on Phakellia ventilabrum. 
Tethea lynewrium (Linn.). “Shetland, 1864” (Bowerbank in litt.). 
spinularis, Bow. The type specimens found on stones from 70-80 
fathoms, Out Skerries Haaf. 
Halicnemia patera, Bow. A very rare and remarkably interesting little 
sponge, found 1863 and 1864, 
Dictyocylindrus virgultosus, Bow. The type specimen found in 1861 in deep 
water off Out Skerries. 
stuposus (Ellis & Sol.). Very 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.8.E. of Whalsey 
Lighthouse. 
Phakellia robusta, Bow. In 100-170 fathoms, 20-25 miles N.N.W. of Burra- 
firth Lighthouse. My finest specimen measures 53 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 levis, 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. Found 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.) 
Hymeraphia 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 
ce 
a ae. ee 
