MARINE ZOOLOGY 



kled, with aperture approximately semi- 

 circular and a more or less pronounced 

 prominence underneath. The connection 

 with adjacent zooecia is not continuous, 

 but vacant spaces occur at intervals around 

 the margin. Common upon scallop shells, 

 etc., from deep water. Hastings. 



PORINID^ 



43. Porina tubuiosa, Norman. 



Zooecia ovate in the lower half, the 

 upper part narrowed and curving upwards, 

 with a circular aperture. A little below 

 this there is a tubular pore, and elsewhere 

 the wall is pitted with pores. Upon old 

 shell of Cardium norvegicum ; rare. Hast- 

 ings. 



44. Lagenipora socialis, Hincks.* 

 Hastings (Miss Jelly). 



Myriozoid^ 



45. Schizoporella unicornis, Johnston. 

 Encrusts rock at low tide ; zooecia rather 



large, square to sexagonal ; aperture semi- 

 circular with sinus in the lower lip. Be- 

 neath there is usually a short blunt spine, 

 and in either or both upper corners an 

 avicularium. In one instance noted, an 

 avicularian zooid had usurped the position 

 of an ordinary zooid, the aperture of the 

 latter appearing as a minute pore immedi- 

 ately above the mandibular apparatus of 

 the former, the zooecium remaining of the 

 normal size but with partial obliteration of 

 outline. Common. Hastings. 



46. Schizoporella vulgaris, Moll.* 

 Hastings. 



47. Schizoporella simplex, Johnston. 

 Encrusting old shells. Zooecia ovate ; 



aperture elevated and with a sinus to the 

 primitive orifice, the matured one being 

 circular. Beneath the aperture, and gener- 

 ally confluent with it, is a blunt promin- 

 ence. Ooecia with a few irregular spiny 

 protuberances. Not very common ; from 

 moderate to deep water. Hastings. 



48. Schizoporella linearis, Hassall. 

 Encrusting old shells. Zooecia oblong, 



arranged in lines ; aperture round, with a 

 small sinus in the lower margin ; front 

 wall with pores. Upon one or both sides 

 of the aperture, and a little below, is 

 placed an avicularium pointing towards it. 

 Common. Hastings. 

 I 89 



49. Schi-zoporella bi-aperta, Michelin. 

 Zooecia more or less oblong ; aperture 



round with a sharp sinus below ; front wall 

 plain. Upon one or both sides of the 

 aperture there is a considerable prominence 

 surmounted by an avicularium. Upon 

 Pecten operculars, etc. From moderately 

 deep water ; rather rare. Hastings. 



50. Schizoporella auriculata, Hassall. 

 Forming round patches upon shells, 



stones, etc. Zocecia square to oblong ; 

 primary aperture round with a sharp sinus 

 in the lower margin ; secondary margin 

 forming a wide loop below, enclosing a 

 short tubular pore (? avicularium). Be- 

 neath the aperture is a strong prominence. 

 Ooecium sometimes crescentic, sometimes 

 orbicular. Not uncommon. Hastings. 



51. Schizoporella discoidea. Busk. 



Zocecia angular, rather short, and with 

 the front wall slightly pitted. Primary 

 aperture has five spines and a narrow sinus; 

 mature orifice circular and raised, but not 

 with an angular or pointed lip as shown in 

 Hincks' figures. Just below, and to the 

 right or left of the aperture, there is a 

 small round avicularium. The ooecia 

 greatly overlap the zocecia. Rather rare. 

 Hastings. 



52. Schizoporella hyalina, Linnaeus. 

 Encrusting seaweed. Zooecia with a 



satin-like gloss, ovate but tapering and 

 curved below. The aperture is round and 

 has a small sinus in the lower lip, beneath 

 which there is a slight umbo. Not uncom- 

 mon. Hastings. 



53. Schizoporella venusta, Norman. 



Upon dead shells. Zooecia glistening, 

 lozenge-shaped to sexagonal ; aperture sub- 

 ovate, slightly disjunct, below which there 

 is a prominence. From moderate to deep 

 water ; rather rare. Hastings. 



54. Mastigophora hyndmanni, Johnston. 

 Zooecium ovate ; aperture sub-circular 



with a narrow sinus ; upon either side is 

 situated a considerably modified avicularium, 

 of which the chamber outline is often pre- 

 served. The mandible is greatly elongated, 

 even more so than in Microporella ciliata, 

 and has now more the appearance of a 

 tapering stick or whip, and is termed by 

 Hincks a vibraculum. Encrusting an old 

 scallop shell from deep water ; rare. Hast- 

 ings. 



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