THORNELY— MARINE POLYZOA OF THE INDIAN OCEAN 153 



avicularia. There is a medium-sized central and two small lateral denticles within the 

 orifice. Ooecia are smooth with a semicircle of curious raised, rounded bosses. 

 Saya de Malha, 150 fath. 



91. Smittia mu7-armata, Kirkpatrick, Ann. Mag. Nat. Hist., ser. 6, i, 1888, 

 p. 80, pi. 8, f. 5. (PI. 8, fig. 14.) 



The best colony in this collection is of a red colour and has often two instead of 

 only one large avicularium. They are raised on the peristome on the sides of the orifice, 

 reaching from rather below this and curving over the top. There are other colonies 

 that have only one avicularium and shorter, looking more like Kirkpatrick's figure. 

 Ooecia, not seen before, are rather flat and have an area of irregular shaped and sized 

 perforations in front, being smooth above. 



Cargados, 30 fath. 



92. Phylactella columnaris, Kirkpatrick, Ann. Mag. Nat. Hist., ser. 6, i, 1888, p. 79. 

 Providence, 29 fath. 



93. Phylactella galeata, n. sp. (PI. 8, fig. 15). 



Zoarium incrusting, pale brown, each large zooecium seen standing out separately by 

 the naked eye. Zooecia with thick walls perforated round the margin with two or three 

 rows of large holes, rising to a long, tapering, tubular neck with a thick rim having a 

 small, pointed mucro on the lower margin, usually, and 10 — 12 thick, oral spines above. 

 The primary orifice has a central, broad and two lateral, small, pointed denticles. Ooecia 

 are raised on the tubular peristome arching over the orifice like a helmet, all the spines 

 showing in front of it. 



Salomon, 75 fath. 



94. Mucronella coccinea, Abild. Hincks, Brit. Mar. Pol., p. 371. 

 Providence, 50 — 78 fatli. 



95. Mucronella porelliformis, Kirkpatrick, Ann. Mag. Nat. Hist., ser. G, i, 1888, p. 8. 

 There are eight spines round the orifice on this species instead of the usual six, and 



where the ooecia are present they all show in front of it. They are long and slender. 

 The orifice has a tooth on either side but none in the centre, the crenulated mucro and 

 long, pointed avicularia directed upwards on either side of the orifice and the small zooecia 

 with glistening verrucose surface are as described by Kirk]iatrick. There are, sometimes, 

 two additional, small, pointed avicularia also directed upwards. Ooecia are open in front. 

 Providence, 29—78 fath. 



96. Mucronella delicatula. Busk, Report Challenger Exp., x, pt. xxx, p. 156. 

 Amirante 25 — 80 fath.; Seychelles; Cargados, 28 fath. 



This species closely resembles var. a oi' Smittia tnspivosa, Johnston*. 



97. Mucronella elleHi, MacG. var. multi-aviculariata, nov. (PI. 8, fig. 16.) 



This variety has 20 marginal spines and has an enormous number of avicularia. 



* Hincks, Brit. Mar. Pol., p. 353. 

 SECOND SERIES— ZOOLOGY, VOL. XV. 20 



