12 MABINE FAUNA OF ST. ANDREWS. 



Mr. David Robertson, in the absence of Mr. Brady, kindly 

 examined similar shell-sand, and also mud from the interstices 

 of Filigrana implexa from deep water. To the foregoing list 

 he adds Discorbina globularis, D'Orb., and gives the follow- 

 ing species from the latter : — 



' 'ornuspirajbliacea, Phil. Moderately common. 

 Quinqmloculina seminulvm, L. Rare. 



subrotunda, Mont. Rare. 



Trochammina incerta, D'Orb. Moderately common. 



Polymorphina lactea : W. &J. Rare. 



Textularia sagittula, Defr. Common. 



Bulimina marginata, D'Orb. Rare. 



Discorbina globular is, D'Orb. Moderately common. 



Truncatulina lobatula, Walker. Common. 



Eotalia Beccarii, L. Moderately rare. 



Patellina corrugata, Will. Rare. 



I Ijierculina ammonoides, Gron. Rare. 



Nonionina depressula, W. & J. 



Order SPONGIAD.E. 



The Sponges of St. Andrews are, perhaps, the least-inves- 

 tigated group, partly because a collection carefully made many 

 years a^o has Uvn List. In looking over those obtained since, 

 Dr. Bowerbank has most kindly given his experienced aid in 

 doubtful eases ; and the description of the new species is solely 

 his. The littoral forms are scattered in considerable profusion 

 between tide-marks under ledges and stones, sometimes near 

 high-water mark. Indeed, in the higher pools and tide-runs 

 in the latter region they are often peculiarly luxuriant. The 

 brightly coloured Halisarca, so abundant on the under surfaces 

 of stones in the Hebrides, and the rarer botryoidal Tethea are 

 unknown at St. Andrews, as are. likewise the cup and turnip 

 sponges of the Zetlandic seas. The greater luxuriance of the 

 ubiquitous Halichondria /larncea on the stems of the Lami- 

 nariie further characterizes the coast of the extreme west ; 



